85631317 has 4 divisors (see below), whose sum is σ = 85651020. Its totient is φ = 85611616.

The previous prime is 85631297. The next prime is 85631327. The reversal of 85631317 is 71313658.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59814756 + 25816561 = 7734^2 + 5081^2 .

It is a cyclic number.

It is not a de Polignac number, because 85631317 - 2¹⁵ = 85598549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85631327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142 + ... + 13087.

It is an arithmetic number, because the mean of its divisors is an integer number (21412755).

Almost surely, 2^85631317 is an apocalyptic number.

It is an amenable number.

85631317 is a deficient number, since it is larger than the sum of its proper divisors (19703).

85631317 is a wasteful number, since it uses less digits than its factorization.

85631317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19702.

The product of its digits is 15120, while the sum is 34.

The square root of 85631317 is about 9253.7190901821. The cubic root of 85631317 is about 440.7688297085.

The spelling of 85631317 in words is "eighty-five million, six hundred thirty-one thousand, three hundred seventeen".