79120991713 has 4 divisors (see below), whose sum is σ = 79258117060. Its totient is φ = 78983866368.

The previous prime is 79120991701. The next prime is 79120991759. The reversal of 79120991713 is 31719902197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31719902197 = 97 ⋅327009301.

It can be written as a sum of positive squares in 2 ways, for example, as 73629737104 + 5491254609 = 271348^2 + 74103^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79120991713 is a prime.

It is a super-2 number, since 2×79120991713² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79120991773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68561808 + ... + 68562961.

It is an arithmetic number, because the mean of its divisors is an integer number (19814529265).

Almost surely, 2^79120991713 is an apocalyptic number.

It is an amenable number.

79120991713 is a deficient number, since it is larger than the sum of its proper divisors (137125347).

79120991713 is a wasteful number, since it uses less digits than its factorization.

79120991713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137125346.

The product of its (nonzero) digits is 214326, while the sum is 49.

The spelling of 79120991713 in words is "seventy-nine billion, one hundred twenty million, nine hundred ninety-one thousand, seven hundred thirteen".