87979231 has 2 divisors, whose sum is σ = 87979232. Its totient is φ = 87979230.

The previous prime is 87979223. The next prime is 87979261. The reversal of 87979231 is 13297978.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87979231 - 2³ = 87979223 is a prime.

It is a super-2 number, since 2×87979231² = 15480690174702722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87979261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43989615 + 43989616.

It is an arithmetic number, because the mean of its divisors is an integer number (43989616).

Almost surely, 2^87979231 is an apocalyptic number.

87979231 is a deficient number, since it is larger than the sum of its proper divisors (1).

87979231 is an equidigital number, since it uses as much as digits as its factorization.

87979231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 46.

The square root of 87979231 is about 9379.7244629040. The cubic root of 87979231 is about 444.7610230557.

The spelling of 87979231 in words is "eighty-seven million, nine hundred seventy-nine thousand, two hundred thirty-one".