86561651 has 4 divisors (see below), whose sum is σ = 94430904. Its totient is φ = 78692400.

The previous prime is 86561647. The next prime is 86561653. The reversal of 86561651 is 15616568.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 86561651 - 2² = 86561647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86561653) 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, 3934610 + ... + 3934631.

It is an arithmetic number, because the mean of its divisors is an integer number (23607726).

Almost surely, 2^86561651 is an apocalyptic number.

86561651 is a deficient number, since it is larger than the sum of its proper divisors (7869253).

86561651 is a wasteful number, since it uses less digits than its factorization.

86561651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7869252.

The product of its digits is 43200, while the sum is 38.

The square root of 86561651 is about 9303.8514068100. The cubic root of 86561651 is about 442.3593151880.

The spelling of 86561651 in words is "eighty-six million, five hundred sixty-one thousand, six hundred fifty-one".