87115431 has 16 divisors (see below), whose sum is σ = 125256320. Its totient is φ = 53537760.

The previous prime is 87115403. The next prime is 87115453. The reversal of 87115431 is 13451178.

It is not a de Polignac number, because 87115431 - 2¹⁰ = 87114407 is a prime.

It is a super-2 number, since 2×87115431² = 15178196636631522, 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 (87113431) 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 15 ways as a sum of consecutive naturals, for example, 56136 + ... + 57666.

It is an arithmetic number, because the mean of its divisors is an integer number (7828520).

Almost surely, 2^87115431 is an apocalyptic number.

87115431 is a deficient number, since it is larger than the sum of its proper divisors (38140889).

87115431 is a wasteful number, since it uses less digits than its factorization.

87115431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006.

The product of its digits is 3360, while the sum is 30.

The square root of 87115431 is about 9333.5647530834. The cubic root of 87115431 is about 443.3006450104.

The spelling of 87115431 in words is "eighty-seven million, one hundred fifteen thousand, four hundred thirty-one".