85631957 has 2 divisors, whose sum is σ = 85631958. Its totient is φ = 85631956.

The previous prime is 85631851. The next prime is 85632007. The reversal of 85631957 is 75913658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79673476 + 5958481 = 8926^2 + 2441^2 .

It is a cyclic number.

It is not a de Polignac number, because 85631957 - 2¹⁰ = 85630933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85631257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42815978 + 42815979.

It is an arithmetic number, because the mean of its divisors is an integer number (42815979).

Almost surely, 2^85631957 is an apocalyptic number.

It is an amenable number.

85631957 is a deficient number, since it is larger than the sum of its proper divisors (1).

85631957 is an equidigital number, since it uses as much as digits as its factorization.

85631957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 44.

The square root of 85631957 is about 9253.7536708084. The cubic root of 85631957 is about 440.7699277933.

The spelling of 85631957 in words is "eighty-five million, six hundred thirty-one thousand, nine hundred fifty-seven".