86145931 has 4 divisors (see below), whose sum is σ = 88924864. Its totient is φ = 83367000.

The previous prime is 86145929. The next prime is 86145937. The reversal of 86145931 is 13954168.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 86145931 - 2¹ = 86145929 is a prime.

It is a super-2 number, since 2×86145931² = 14842242855713522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86145937) 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, 1389420 + ... + 1389481.

It is an arithmetic number, because the mean of its divisors is an integer number (22231216).

Almost surely, 2^86145931 is an apocalyptic number.

86145931 is a deficient number, since it is larger than the sum of its proper divisors (2778933).

86145931 is a wasteful number, since it uses less digits than its factorization.

86145931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778932.

The product of its digits is 25920, while the sum is 37.

The square root of 86145931 is about 9281.4832327597. The cubic root of 86145931 is about 441.6500218877.

The spelling of 86145931 in words is "eighty-six million, one hundred forty-five thousand, nine hundred thirty-one".