87318031 has 4 divisors (see below), whose sum is σ = 87375600. Its totient is φ = 87260464.

The previous prime is 87318029. The next prime is 87318059. The reversal of 87318031 is 13081378.

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 87318031 - 2¹ = 87318029 is a prime.

It is a super-2 number, since 2×87318031² = 15248877075433922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87317984 and 87318002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87318061) 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, 26446 + ... + 29563.

It is an arithmetic number, because the mean of its divisors is an integer number (21843900).

Almost surely, 2^87318031 is an apocalyptic number.

87318031 is a deficient number, since it is larger than the sum of its proper divisors (57569).

87318031 is a wasteful number, since it uses less digits than its factorization.

87318031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57568.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 87318031 is about 9344.4117524861. The cubic root of 87318031 is about 443.6440329925.

The spelling of 87318031 in words is "eighty-seven million, three hundred eighteen thousand, thirty-one".