86555691 has 24 divisors (see below), whose sum is σ = 132846480. Its totient is φ = 54202176.

The previous prime is 86555683. The next prime is 86555699. The reversal of 86555691 is 19655568.

It is a happy number.

86555691 is a `hidden beast` number, since 8 + 6 + 5 + 556 + 91 = 666.

It is an interprime number because it is at equal distance from previous prime (86555683) and next prime (86555699).

It is not a de Polignac number, because 86555691 - 2³ = 86555683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86555699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5176 + ... + 14138.

It is an arithmetic number, because the mean of its divisors is an integer number (5535270).

Almost surely, 2^86555691 is an apocalyptic number.

86555691 is a deficient number, since it is larger than the sum of its proper divisors (46290789).

86555691 is a wasteful number, since it uses less digits than its factorization.

86555691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9035 (or 9032 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 86555691 is about 9303.5311038336. The cubic root of 86555691 is about 442.3491624164.

The spelling of 86555691 in words is "eighty-six million, five hundred fifty-five thousand, six hundred ninety-one".