87515913 has 4 divisors (see below), whose sum is σ = 116687888. Its totient is φ = 58343940.

The previous prime is 87515903. The next prime is 87515917. The reversal of 87515913 is 31951578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87515913 - 2¹² = 87511817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87515917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14585983 + ... + 14585988.

It is an arithmetic number, because the mean of its divisors is an integer number (29171972).

Almost surely, 2^87515913 is an apocalyptic number.

It is an amenable number.

87515913 is a deficient number, since it is larger than the sum of its proper divisors (29171975).

87515913 is a wasteful number, since it uses less digits than its factorization.

87515913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29171974.

The product of its digits is 37800, while the sum is 39.

The square root of 87515913 is about 9354.9940138944. The cubic root of 87515913 is about 443.9789120331.

The spelling of 87515913 in words is "eighty-seven million, five hundred fifteen thousand, nine hundred thirteen".