87031131 has 16 divisors (see below), whose sum is σ = 127716480. Its totient is φ = 52277120.

The previous prime is 87031099. The next prime is 87031157. The reversal of 87031131 is 13113078.

It is a cyclic number.

It is not a de Polignac number, because 87031131 - 2⁵ = 87031099 is a prime.

It is a super-2 number, since 2×87031131² = 15148835526278322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87031181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7941 + ... + 15398.

It is an arithmetic number, because the mean of its divisors is an integer number (7982280).

Almost surely, 2^87031131 is an apocalyptic number.

87031131 is a deficient number, since it is larger than the sum of its proper divisors (40685349).

87031131 is a wasteful number, since it uses less digits than its factorization.

87031131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23466.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 87031131 is about 9329.0477005962. The cubic root of 87031131 is about 443.1576075692.

The spelling of 87031131 in words is "eighty-seven million, thirty-one thousand, one hundred thirty-one".