86321691 has 18 divisors (see below), whose sum is σ = 130350948. Its totient is φ = 55042680.

The previous prime is 86321671. The next prime is 86321707. The reversal of 86321691 is 19612368.

86321691 is a `hidden beast` number, since 8 + 632 + 16 + 9 + 1 = 666.

It is not a de Polignac number, because 86321691 - 2⁵ = 86321659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86321611) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4305 + ... + 13826.

Almost surely, 2^86321691 is an apocalyptic number.

86321691 is a deficient number, since it is larger than the sum of its proper divisors (44029257).

86321691 is a wasteful number, since it uses less digits than its factorization.

86321691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18183 (or 18157 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 86321691 is about 9290.9467224821. The cubic root of 86321691 is about 441.9501779732.

The spelling of 86321691 in words is "eighty-six million, three hundred twenty-one thousand, six hundred ninety-one".