87551631 has 16 divisors (see below), whose sum is σ = 130658400. Its totient is φ = 57939264.

The previous prime is 87551627. The next prime is 87551663. The reversal of 87551631 is 13615578.

It is not a de Polignac number, because 87551631 - 2² = 87551627 is a prime.

It is a super-2 number, since 2×87551631² = 15330576181520322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87551231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8136 + ... + 15533.

It is an arithmetic number, because the mean of its divisors is an integer number (8166150).

Almost surely, 2^87551631 is an apocalyptic number.

87551631 is a deficient number, since it is larger than the sum of its proper divisors (43106769).

87551631 is a wasteful number, since it uses less digits than its factorization.

87551631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23815 (or 23809 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 87551631 is about 9356.9028529744. The cubic root of 87551631 is about 444.0393044095.

The spelling of 87551631 in words is "eighty-seven million, five hundred fifty-one thousand, six hundred thirty-one".