87318831 has 4 divisors (see below), whose sum is σ = 116425112. Its totient is φ = 58212552.

The previous prime is 87318799. The next prime is 87318841. The reversal of 87318831 is 13881378.

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

It is not a de Polignac number, because 87318831 - 2⁵ = 87318799 is a prime.

It is a super-2 number, since 2×87318831² = 15249156494413122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87318831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87318841) 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, 14553136 + ... + 14553141.

It is an arithmetic number, because the mean of its divisors is an integer number (29106278).

Almost surely, 2^87318831 is an apocalyptic number.

87318831 is a deficient number, since it is larger than the sum of its proper divisors (29106281).

87318831 is a wasteful number, since it uses less digits than its factorization.

87318831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29106280.

The product of its digits is 32256, while the sum is 39.

The square root of 87318831 is about 9344.4545587209. The cubic root of 87318831 is about 443.6453878641.

The spelling of 87318831 in words is "eighty-seven million, three hundred eighteen thousand, eight hundred thirty-one".