86321561 has 8 divisors (see below), whose sum is σ = 87493224. Its totient is φ = 85155840.

The previous prime is 86321531. The next prime is 86321567. The reversal of 86321561 is 16512368.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 295936 + 86025625 = 544^2 + 9275^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86321561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86321567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32981 + ... + 35501.

It is an arithmetic number, because the mean of its divisors is an integer number (10936653).

Almost surely, 2^86321561 is an apocalyptic number.

It is an amenable number.

86321561 is a deficient number, since it is larger than the sum of its proper divisors (1171663).

86321561 is a wasteful number, since it uses less digits than its factorization.

86321561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971.

The product of its digits is 8640, while the sum is 32.

The square root of 86321561 is about 9290.9397264216. The cubic root of 86321561 is about 441.9499561149.

The spelling of 86321561 in words is "eighty-six million, three hundred twenty-one thousand, five hundred sixty-one".