685579031 has 4 divisors (see below), whose sum is σ = 704108232. Its totient is φ = 667049832.

The previous prime is 685579003. The next prime is 685579051. The reversal of 685579031 is 130975586.

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 685579031 - 2²² = 681384727 is a prime.

It is a super-2 number, since 2×685579031² = 940037215493797922, 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 (685579051) 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, 9264545 + ... + 9264618.

It is an arithmetic number, because the mean of its divisors is an integer number (176027058).

Almost surely, 2^685579031 is an apocalyptic number.

685579031 is a deficient number, since it is larger than the sum of its proper divisors (18529201).

685579031 is a wasteful number, since it uses less digits than its factorization.

685579031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18529200.

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

The square root of 685579031 is about 26183.5641385966. The cubic root of 685579031 is about 881.7642940306.

The spelling of 685579031 in words is "six hundred eighty-five million, five hundred seventy-nine thousand, thirty-one".