79805731 has 2 divisors, whose sum is σ = 79805732. Its totient is φ = 79805730.

The previous prime is 79805729. The next prime is 79805753. The reversal of 79805731 is 13750897.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79805731 - 2¹ = 79805729 is a prime.

It is a super-2 number, since 2×79805731² = 12737909400888722, which contains 22 as substring.

Together with 79805729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (79805431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39902865 + 39902866.

It is an arithmetic number, because the mean of its divisors is an integer number (39902866).

Almost surely, 2^79805731 is an apocalyptic number.

79805731 is a deficient number, since it is larger than the sum of its proper divisors (1).

79805731 is an equidigital number, since it uses as much as digits as its factorization.

79805731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 79805731 is about 8933.4053417496. The cubic root of 79805731 is about 430.5378720735.

The spelling of 79805731 in words is "seventy-nine million, eight hundred five thousand, seven hundred thirty-one".