87317531 has 4 divisors (see below), whose sum is σ = 99791472. Its totient is φ = 74843592.

The previous prime is 87317513. The next prime is 87317537. The reversal of 87317531 is 13571378.

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

It is a cyclic number.

It is not a de Polignac number, because 87317531 - 2⁶ = 87317467 is a prime.

It is a super-2 number, since 2×87317531² = 15248702439871922, 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 = 87317491 and 87317500.

It is not an unprimeable number, because it can be changed into a prime (87317537) 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, 6236960 + ... + 6236973.

It is an arithmetic number, because the mean of its divisors is an integer number (24947868).

Almost surely, 2^87317531 is an apocalyptic number.

87317531 is a deficient number, since it is larger than the sum of its proper divisors (12473941).

87317531 is a wasteful number, since it uses less digits than its factorization.

87317531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12473940.

The product of its digits is 17640, while the sum is 35.

The square root of 87317531 is about 9344.3849984897. The cubic root of 87317531 is about 443.6431861936.

The spelling of 87317531 in words is "eighty-seven million, three hundred seventeen thousand, five hundred thirty-one".