86531657 has 4 divisors (see below), whose sum is σ = 87192336. Its totient is φ = 85870980.

The previous prime is 86531617. The next prime is 86531713. The reversal of 86531657 is 75613568.

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 86531657 - 2²⁰ = 85483081 is a prime.

It is a super-4 number, since 4×86531657⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86531617) 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, 330143 + ... + 330404.

It is an arithmetic number, because the mean of its divisors is an integer number (21798084).

Almost surely, 2^86531657 is an apocalyptic number.

It is an amenable number.

86531657 is a deficient number, since it is larger than the sum of its proper divisors (660679).

86531657 is a wasteful number, since it uses less digits than its factorization.

86531657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660678.

The product of its digits is 151200, while the sum is 41.

The square root of 86531657 is about 9302.2393540480. The cubic root of 86531657 is about 442.3082161239.

The spelling of 86531657 in words is "eighty-six million, five hundred thirty-one thousand, six hundred fifty-seven".