87531 has 8 divisors (see below), whose sum is σ = 118080. Its totient is φ = 57672.

The previous prime is 87523. The next prime is 87539. The reversal of 87531 is 13578.

It is an interprime number because it is at equal distance from previous prime (87523) and next prime (87539).

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

It is not a de Polignac number, because 87531 - 2³ = 87523 is a prime.

It is a super-2 number, since 2×87531² = 15323351922, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400 + ... + 578.

It is an arithmetic number, because the mean of its divisors is an integer number (14760).

2⁸⁷⁵³¹ is an apocalyptic number.

87531 is a deficient number, since it is larger than the sum of its proper divisors (30549).

87531 is a wasteful number, since it uses less digits than its factorization.

87531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345.

The product of its digits is 840, while the sum is 24.

The square root of 87531 is about 295.8563840785. The cubic root of 87531 is about 44.4004423298.

The spelling of 87531 in words is "eighty-seven thousand, five hundred thirty-one".