87397531 has 8 divisors (see below), whose sum is σ = 94427424. Its totient is φ = 80411520.

The previous prime is 87397529. The next prime is 87397537. The reversal of 87397531 is 13579378.

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

It is a cyclic number.

It is not a de Polignac number, because 87397531 - 2¹ = 87397529 is a prime.

It is a super-2 number, since 2×87397531² = 15276656849791922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87397537) 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, 6766 + ... + 14851.

It is an arithmetic number, because the mean of its divisors is an integer number (11803428).

Almost surely, 2^87397531 is an apocalyptic number.

87397531 is a deficient number, since it is larger than the sum of its proper divisors (7029893).

87397531 is a wasteful number, since it uses less digits than its factorization.

87397531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21941.

The product of its digits is 158760, while the sum is 43.

The square root of 87397531 is about 9348.6646640042. The cubic root of 87397531 is about 443.7786329207.

The spelling of 87397531 in words is "eighty-seven million, three hundred ninety-seven thousand, five hundred thirty-one".