86665431 has 16 divisors (see below), whose sum is σ = 118752480. Its totient is φ = 56186880.

The previous prime is 86665417. The next prime is 86665451. The reversal of 86665431 is 13456668.

It is not a de Polignac number, because 86665431 - 2¹⁰ = 86664407 is a prime.

It is a super-2 number, since 2×86665431² = 15021793860831522, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 86665431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86665451) 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, 44935 + ... + 46823.

It is an arithmetic number, because the mean of its divisors is an integer number (7422030).

Almost surely, 2^86665431 is an apocalyptic number.

86665431 is a deficient number, since it is larger than the sum of its proper divisors (32087049).

86665431 is a wasteful number, since it uses less digits than its factorization.

86665431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306.

The product of its digits is 103680, while the sum is 39.

The square root of 86665431 is about 9309.4269963301. The cubic root of 86665431 is about 442.5360282198.

The spelling of 86665431 in words is "eighty-six million, six hundred sixty-five thousand, four hundred thirty-one".