86506581 has 16 divisors (see below), whose sum is σ = 133789184. Its totient is φ = 48693744.

The previous prime is 86506579. The next prime is 86506603. The reversal of 86506581 is 18560568.

It is not a de Polignac number, because 86506581 - 2¹ = 86506579 is a prime.

It is a super-2 number, since 2×86506581² = 14966777112619122, 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 (86506781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29335 + ... + 32148.

It is an arithmetic number, because the mean of its divisors is an integer number (8361824).

Almost surely, 2^86506581 is an apocalyptic number.

It is an amenable number.

86506581 is a deficient number, since it is larger than the sum of its proper divisors (47282603).

86506581 is a wasteful number, since it uses less digits than its factorization.

86506581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61560.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 86506581 is about 9300.8914088919. The cubic root of 86506581 is about 442.2654865119.

The spelling of 86506581 in words is "eighty-six million, five hundred six thousand, five hundred eighty-one".