86519581 has 4 divisors (see below), whose sum is σ = 86558272. Its totient is φ = 86480892.

The previous prime is 86519567. The next prime is 86519593. The reversal of 86519581 is 18591568.

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 86519581 - 2⁷ = 86519453 is a prime.

It is a super-2 number, since 2×86519581² = 14971275792831122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86519551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15771 + ... + 20536.

It is an arithmetic number, because the mean of its divisors is an integer number (21639568).

Almost surely, 2^86519581 is an apocalyptic number.

It is an amenable number.

86519581 is a deficient number, since it is larger than the sum of its proper divisors (38691).

86519581 is a wasteful number, since it uses less digits than its factorization.

86519581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38690.

The product of its digits is 86400, while the sum is 43.

The square root of 86519581 is about 9301.5902403836. The cubic root of 86519581 is about 442.2876395985.

The spelling of 86519581 in words is "eighty-six million, five hundred nineteen thousand, five hundred eighty-one".