87131 has 6 divisors (see below), whose sum is σ = 96132. Its totient is φ = 78320.

The previous prime is 87121. The next prime is 87133. The reversal of 87131 is 13178.

It is a de Polignac number, because none of the positive numbers 2^k-87131 is a prime.

It is a super-2 number, since 2×87131² = 15183622322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 935 + ... + 1023.

It is an arithmetic number, because the mean of its divisors is an integer number (16022).

2⁸⁷¹³¹ is an apocalyptic number.

87131 is a deficient number, since it is larger than the sum of its proper divisors (9001).

87131 is an equidigital number, since it uses as much as digits as its factorization.

87131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 100 counting only the distinct ones).

The product of its digits is 168, while the sum is 20.

The square root of 87131 is about 295.1796063416. The cubic root of 87131 is about 44.3327051877.

The spelling of 87131 in words is "eighty-seven thousand, one hundred thirty-one".