87531172313 has 8 divisors (see below), whose sum is σ = 99809300808. Its totient is φ = 76045181184.

The previous prime is 87531172303. The next prime is 87531172319. The reversal of 87531172313 is 31327113578.

It can be written as a sum of positive squares in 4 ways, for example, as 13673326489 + 73857845824 = 116933^2 + 271768^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87531172313 - 2²⁴ = 87514395097 is a prime.

It is a super-2 number, since 2×87531172313² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87531172319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198034106 + ... + 198034547.

It is an arithmetic number, because the mean of its divisors is an integer number (12476162601).

Almost surely, 2^87531172313 is an apocalyptic number.

It is an amenable number.

87531172313 is a deficient number, since it is larger than the sum of its proper divisors (12278128495).

87531172313 is a wasteful number, since it uses less digits than its factorization.

87531172313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396068683.

The product of its digits is 105840, while the sum is 41.

The spelling of 87531172313 in words is "eighty-seven billion, five hundred thirty-one million, one hundred seventy-two thousand, three hundred thirteen".