86712561 has 36 divisors (see below), whose sum is σ = 142428468. Its totient is φ = 50528448.

The previous prime is 86712559. The next prime is 86712569. The reversal of 86712561 is 16521768.

86712561 is a `hidden beast` number, since 86 + 7 + 12 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27499536 + 59213025 = 5244^2 + 7695^2 .

It is not a de Polignac number, because 86712561 - 2¹ = 86712559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86712569) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 41211 + ... + 43263.

Almost surely, 2^86712561 is an apocalyptic number.

It is an amenable number.

86712561 is a deficient number, since it is larger than the sum of its proper divisors (55715907).

86712561 is a wasteful number, since it uses less digits than its factorization.

86712561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110 (or 2088 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 86712561 is about 9311.9579573793. The cubic root of 86712561 is about 442.6162329918.

The spelling of 86712561 in words is "eighty-six million, seven hundred twelve thousand, five hundred sixty-one".