685636331 has 8 divisors (see below), whose sum is σ = 715708800. Its totient is φ = 656061120.

The previous prime is 685636309. The next prime is 685636349. The reversal of 685636331 is 133636586.

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 685636331 - 2⁶ = 685636267 is a prime.

It is a super-2 number, since 2×685636331² = 940194356774283122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685636631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121496 + ... + 127013.

It is an arithmetic number, because the mean of its divisors is an integer number (89463600).

Almost surely, 2^685636331 is an apocalyptic number.

685636331 is a deficient number, since it is larger than the sum of its proper divisors (30072469).

685636331 is a wasteful number, since it uses less digits than its factorization.

685636331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248629.

The product of its digits is 233280, while the sum is 41.

The square root of 685636331 is about 26184.6583136004. The cubic root of 685636331 is about 881.7888590014.

The spelling of 685636331 in words is "six hundred eighty-five million, six hundred thirty-six thousand, three hundred thirty-one".