79813231897 has 4 divisors (see below), whose sum is σ = 91215122176. Its totient is φ = 68411341620.

The previous prime is 79813231879. The next prime is 79813231909.

79813231897 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79813231897 - 2¹¹ = 79813229849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79813231807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5700945129 + ... + 5700945142.

It is an arithmetic number, because the mean of its divisors is an integer number (22803780544).

Almost surely, 2^79813231897 is an apocalyptic number.

It is an amenable number.

79813231897 is a deficient number, since it is larger than the sum of its proper divisors (11401890279).

79813231897 is a wasteful number, since it uses less digits than its factorization.

79813231897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11401890278.

The product of its digits is 4572288, while the sum is 58.

The spelling of 79813231897 in words is "seventy-nine billion, eight hundred thirteen million, two hundred thirty-one thousand, eight hundred ninety-seven".