87982131 has 4 divisors (see below), whose sum is σ = 117309512. Its totient is φ = 58654752.

The previous prime is 87982127. The next prime is 87982133. The reversal of 87982131 is 13128978.

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

It is not a de Polignac number, because 87982131 - 2² = 87982127 is a prime.

It is a super-2 number, since 2×87982131² = 15481710750602322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87982131.

It is not an unprimeable number, because it can be changed into a prime (87982133) 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, 14663686 + ... + 14663691.

It is an arithmetic number, because the mean of its divisors is an integer number (29327378).

Almost surely, 2^87982131 is an apocalyptic number.

87982131 is a deficient number, since it is larger than the sum of its proper divisors (29327381).

87982131 is a wasteful number, since it uses less digits than its factorization.

87982131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29327380.

The product of its digits is 24192, while the sum is 39.

The square root of 87982131 is about 9379.8790503929. The cubic root of 87982131 is about 444.7659097878.

The spelling of 87982131 in words is "eighty-seven million, nine hundred eighty-two thousand, one hundred thirty-one".