85723402631 has 4 divisors (see below), whose sum is σ = 85727368032. Its totient is φ = 85719437232.

The previous prime is 85723402591. The next prime is 85723402637. The reversal of 85723402631 is 13620432758.

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

It is a cyclic number.

It is not a de Polignac number, because 85723402631 - 2¹⁸ = 85723140487 is a prime.

It is a super-2 number, since 2×85723402631² (a number of 23 digits) 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 (85723402637) 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 3 ways as a sum of consecutive naturals, for example, 1950095 + ... + 1993568.

It is an arithmetic number, because the mean of its divisors is an integer number (21431842008).

Almost surely, 2^85723402631 is an apocalyptic number.

85723402631 is a deficient number, since it is larger than the sum of its proper divisors (3965401).

85723402631 is a wasteful number, since it uses less digits than its factorization.

85723402631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3965400.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 85723402631 in words is "eighty-five billion, seven hundred twenty-three million, four hundred two thousand, six hundred thirty-one".