86172513981 has 16 divisors (see below), whose sum is σ = 116501550720. Its totient is φ = 56646328320.

The previous prime is 86172513961. The next prime is 86172513991. The reversal of 86172513981 is 18931527168.

It is a de Polignac number, because none of the positive numbers 2^k-86172513981 is a prime.

It is a super-2 number, since 2×86172513981² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86172513961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 806205 + ... + 906813.

It is an arithmetic number, because the mean of its divisors is an integer number (7281346920).

Almost surely, 2^86172513981 is an apocalyptic number.

It is an amenable number.

86172513981 is a deficient number, since it is larger than the sum of its proper divisors (30329036739).

86172513981 is a wasteful number, since it uses less digits than its factorization.

86172513981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104596.

The product of its digits is 725760, while the sum is 51.

The spelling of 86172513981 in words is "eighty-six billion, one hundred seventy-two million, five hundred thirteen thousand, nine hundred eighty-one".