87031 has 4 divisors (see below), whose sum is σ = 99472. Its totient is φ = 74592.

The previous prime is 87013. The next prime is 87037. The reversal of 87031 is 13078.

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

It is not a de Polignac number, because 87031 - 2¹³ = 78839 is a prime.

It is a super-2 number, since 2×87031² = 15148789922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6210 + ... + 6223.

It is an arithmetic number, because the mean of its divisors is an integer number (24868).

2⁸⁷⁰³¹ is an apocalyptic number.

87031 is a deficient number, since it is larger than the sum of its proper divisors (12441).

87031 is a wasteful number, since it uses less digits than its factorization.

87031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12440.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 87031 is about 295.0101693162. The cubic root of 87031 is about 44.3157385221.

The spelling of 87031 in words is "eighty-seven thousand, thirty-one".