87918031 has 4 divisors (see below), whose sum is σ = 90294232. Its totient is φ = 85541832.

The previous prime is 87918011. The next prime is 87918037. The reversal of 87918031 is 13081978.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87918031 is a prime.

It is a super-2 number, since 2×87918031² = 15459160349833922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 2376163 = 87918031 / (8 + 7 + 9 + 1 + 8 + 0 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87918037) 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, 1188045 + ... + 1188118.

It is an arithmetic number, because the mean of its divisors is an integer number (22573558).

Almost surely, 2^87918031 is an apocalyptic number.

87918031 is a deficient number, since it is larger than the sum of its proper divisors (2376201).

87918031 is a wasteful number, since it uses less digits than its factorization.

87918031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376200.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 87918031 is about 9376.4615394081. The cubic root of 87918031 is about 444.6578711028.

The spelling of 87918031 in words is "eighty-seven million, nine hundred eighteen thousand, thirty-one".