85317631 has 8 divisors (see below), whose sum is σ = 97718400. Its totient is φ = 72970008.

The previous prime is 85317613. The next prime is 85317641. The reversal of 85317631 is 13671358.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85317631 - 2⁹ = 85317119 is a prime.

It is a super-2 number, since 2×85317631² = 14558196318904322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85317641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9781 + ... + 16318.

It is an arithmetic number, because the mean of its divisors is an integer number (12214800).

Almost surely, 2^85317631 is an apocalyptic number.

85317631 is a deficient number, since it is larger than the sum of its proper divisors (12400769).

85317631 is a wasteful number, since it uses less digits than its factorization.

85317631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26573.

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

The square root of 85317631 is about 9236.7543542091. The cubic root of 85317631 is about 440.2299607157.

Adding to 85317631 its reverse (13671358), we get a palindrome (98988989).

The spelling of 85317631 in words is "eighty-five million, three hundred seventeen thousand, six hundred thirty-one".