86242561 has 4 divisors (see below), whose sum is σ = 87281712. Its totient is φ = 85203412.

The previous prime is 86242543. The next prime is 86242567. The reversal of 86242561 is 16524268.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86242561 - 2⁵ = 86242529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86242567) 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, 519451 + ... + 519616.

It is an arithmetic number, because the mean of its divisors is an integer number (21820428).

Almost surely, 2^86242561 is an apocalyptic number.

It is an amenable number.

86242561 is a deficient number, since it is larger than the sum of its proper divisors (1039151).

86242561 is a wasteful number, since it uses less digits than its factorization.

86242561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039150.

The product of its digits is 23040, while the sum is 34.

The square root of 86242561 is about 9286.6872995703. The cubic root of 86242561 is about 441.8150933126.

The spelling of 86242561 in words is "eighty-six million, two hundred forty-two thousand, five hundred sixty-one".