87512831 has 4 divisors (see below), whose sum is σ = 100014672. Its totient is φ = 75010992.

The previous prime is 87512809. The next prime is 87512833. The reversal of 87512831 is 13821578.

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

It is not a de Polignac number, because 87512831 - 2¹⁴ = 87496447 is a prime.

It is a super-2 number, since 2×87512831² = 15316991179269122, 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 = 87512791 and 87512800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87512833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6250910 + ... + 6250923.

It is an arithmetic number, because the mean of its divisors is an integer number (25003668).

Almost surely, 2^87512831 is an apocalyptic number.

87512831 is a deficient number, since it is larger than the sum of its proper divisors (12501841).

87512831 is a wasteful number, since it uses less digits than its factorization.

87512831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12501840.

The product of its digits is 13440, while the sum is 35.

The square root of 87512831 is about 9354.8292875926. The cubic root of 87512831 is about 443.9737001845.

The spelling of 87512831 in words is "eighty-seven million, five hundred twelve thousand, eight hundred thirty-one".