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73 is a prime number from 1-100. 73 has 2 factors, 1 and 73. It is the 21st prime number, and the 21st prime number from 1-100.

As an Exponent of Mersenne Number

273 - 1 can be divided by 439, and is therefore not a prime number.

Relationship with other odd numbers

The number reversed

• 73 is the 21st prime number, 73 reversed is 37. 37 is the 12th prime number and 12 is 21 reversed.

The numbers before

• The previous odd number, 71, is a prime number.
• There are no odd numbers between 71 and 73. As a result, they are twin primes.
• The odd number previous to 71 is 69. 69 is not a prime number. It is divisible by 3.
• The odd number previous to 69 is 67. 67 is a prime number.
• 67 and 73 are six numbers apart; therefore, they are primes.

The numbers after

• The next odd number, 75, is not a prime number. It is divisible by 5.
• 77, the odd number following 75, is also not a prime number. It is divisible by 7.
• 79, the odd number following 77, is a prime number.
• 73 and 79 are six numbers apart; therefore, they are sexy primes.
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