87512913 has 8 divisors (see below), whose sum is σ = 129648800. Its totient is φ = 58341924.

The previous prime is 87512897. The next prime is 87512933. The reversal of 87512913 is 31921578.

It is not a de Polignac number, because 87512913 - 2⁴ = 87512897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87512933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1620583 + ... + 1620636.

It is an arithmetic number, because the mean of its divisors is an integer number (16206100).

Almost surely, 2^87512913 is an apocalyptic number.

It is an amenable number.

87512913 is a deficient number, since it is larger than the sum of its proper divisors (42135887).

87512913 is a wasteful number, since it uses less digits than its factorization.

87512913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241228 (or 3241222 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 87512913 is about 9354.8336703546. The cubic root of 87512913 is about 443.9738388530.

It can be divided in two parts, 8751 and 2913, that added together give a square (11664 = 108²).

The spelling of 87512913 in words is "eighty-seven million, five hundred twelve thousand, nine hundred thirteen".