85631807 has 2 divisors, whose sum is σ = 85631808. Its totient is φ = 85631806.

The previous prime is 85631761. The next prime is 85631837. The reversal of 85631807 is 70813658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85631807 - 2⁸ = 85631551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85631837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42815903 + 42815904.

It is an arithmetic number, because the mean of its divisors is an integer number (42815904).

Almost surely, 2^85631807 is an apocalyptic number.

85631807 is a deficient number, since it is larger than the sum of its proper divisors (1).

85631807 is an equidigital number, since it uses as much as digits as its factorization.

85631807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 85631807 is about 9253.7455659857. The cubic root of 85631807 is about 440.7696704302.

The spelling of 85631807 in words is "eighty-five million, six hundred thirty-one thousand, eight hundred seven".