87118957 has 2 divisors, whose sum is σ = 87118958. Its totient is φ = 87118956.

The previous prime is 87118949. The next prime is 87118981. The reversal of 87118957 is 75981178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84750436 + 2368521 = 9206^2 + 1539^2 .

It is a cyclic number.

It is not a de Polignac number, because 87118957 - 2³ = 87118949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87118907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43559478 + 43559479.

It is an arithmetic number, because the mean of its divisors is an integer number (43559479).

Almost surely, 2^87118957 is an apocalyptic number.

It is an amenable number.

87118957 is a deficient number, since it is larger than the sum of its proper divisors (1).

87118957 is an equidigital number, since it uses as much as digits as its factorization.

87118957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 46.

The square root of 87118957 is about 9333.7536393457. The cubic root of 87118957 is about 443.3066257992.

The spelling of 87118957 in words is "eighty-seven million, one hundred eighteen thousand, nine hundred fifty-seven".