86156561 has 8 divisors (see below), whose sum is σ = 91350504. Its totient is φ = 80976640.

The previous prime is 86156557. The next prime is 86156599. The reversal of 86156561 is 16565168.

It can be written as a sum of positive squares in 4 ways, for example, as 483025 + 85673536 = 695^2 + 9256^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 86156561 - 2² = 86156557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86156501) 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, 10871 + ... + 17043.

It is an arithmetic number, because the mean of its divisors is an integer number (11418813).

Almost surely, 2^86156561 is an apocalyptic number.

It is an amenable number.

86156561 is a deficient number, since it is larger than the sum of its proper divisors (5193943).

86156561 is a wasteful number, since it uses less digits than its factorization.

86156561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011.

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

The square root of 86156561 is about 9282.0558606378. The cubic root of 86156561 is about 441.6681869810.

The spelling of 86156561 in words is "eighty-six million, one hundred fifty-six thousand, five hundred sixty-one".