79949731 has 2 divisors, whose sum is σ = 79949732. Its totient is φ = 79949730.

The previous prime is 79949729. The next prime is 79949741. The reversal of 79949731 is 13794997.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79949731 - 2¹ = 79949729 is a prime.

It is a super-2 number, since 2×79949731² = 12783918973944722, which contains 22 as substring.

Together with 79949729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (79949741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39974865 + 39974866.

It is an arithmetic number, because the mean of its divisors is an integer number (39974866).

Almost surely, 2^79949731 is an apocalyptic number.

79949731 is a deficient number, since it is larger than the sum of its proper divisors (1).

79949731 is an equidigital number, since it uses as much as digits as its factorization.

79949731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 49.

The square root of 79949731 is about 8941.4613458875. The cubic root of 79949731 is about 430.7966680318.

The spelling of 79949731 in words is "seventy-nine million, nine hundred forty-nine thousand, seven hundred thirty-one".