87685831 has 2 divisors, whose sum is σ = 87685832. Its totient is φ = 87685830.

The previous prime is 87685799. The next prime is 87685837. The reversal of 87685831 is 13858678.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87685831 - 2⁵ = 87685799 is a prime.

It is a super-2 number, since 2×87685831² = 15377609916321122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87685837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43842915 + 43842916.

It is an arithmetic number, because the mean of its divisors is an integer number (43842916).

Almost surely, 2^87685831 is an apocalyptic number.

87685831 is a deficient number, since it is larger than the sum of its proper divisors (1).

87685831 is an equidigital number, since it uses as much as digits as its factorization.

87685831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 46.

The square root of 87685831 is about 9364.0712833681. The cubic root of 87685831 is about 444.2660645247.

The spelling of 87685831 in words is "eighty-seven million, six hundred eighty-five thousand, eight hundred thirty-one".