79057171931 has 4 divisors (see below), whose sum is σ = 79149854112. Its totient is φ = 78964489752.

The previous prime is 79057171891. The next prime is 79057171937. The reversal of 79057171931 is 13917175097.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79057171931 - 2⁶ = 79057171867 is a prime.

It is a super-2 number, since 2×79057171931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79057171931.

It is not an unprimeable number, because it can be changed into a prime (79057171937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46339811 + ... + 46341516.

It is an arithmetic number, because the mean of its divisors is an integer number (19787463528).

Almost surely, 2^79057171931 is an apocalyptic number.

79057171931 is a deficient number, since it is larger than the sum of its proper divisors (92682181).

79057171931 is an equidigital number, since it uses as much as digits as its factorization.

79057171931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92682180.

The product of its (nonzero) digits is 416745, while the sum is 50.

The spelling of 79057171931 in words is "seventy-nine billion, fifty-seven million, one hundred seventy-one thousand, nine hundred thirty-one".