87515791 has 6 divisors (see below), whose sum is σ = 96195176. Its totient is φ = 79559700.

The previous prime is 87515783. The next prime is 87515801. The reversal of 87515791 is 19751578.

It is not a de Polignac number, because 87515791 - 2³ = 87515783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87515731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 361515 + ... + 361756.

Almost surely, 2^87515791 is an apocalyptic number.

87515791 is a deficient number, since it is larger than the sum of its proper divisors (8679385).

87515791 is a wasteful number, since it uses less digits than its factorization.

87515791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723293 (or 723282 counting only the distinct ones).

The product of its digits is 88200, while the sum is 43.

The square root of 87515791 is about 9354.9874933107. The cubic root of 87515791 is about 443.9787057260.

The spelling of 87515791 in words is "eighty-seven million, five hundred fifteen thousand, seven hundred ninety-one".