685931231 has 8 divisors (see below), whose sum is σ = 717813600. Its totient is φ = 654220512.

The previous prime is 685931161. The next prime is 685931243. The reversal of 685931231 is 132139586.

It is a happy number.

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 685931231 - 2¹⁴ = 685914847 is a prime.

It is a super-2 number, since 2×685931231² = 941003307322350722, 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 (685931261) 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, 34700 + ... + 50753.

It is an arithmetic number, because the mean of its divisors is an integer number (89726700).

Almost surely, 2^685931231 is an apocalyptic number.

685931231 is a deficient number, since it is larger than the sum of its proper divisors (31882369).

685931231 is a wasteful number, since it uses less digits than its factorization.

685931231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85825.

The product of its digits is 38880, while the sum is 38.

The square root of 685931231 is about 26190.2888682046. The cubic root of 685931231 is about 881.9152633597.

The spelling of 685931231 in words is "six hundred eighty-five million, nine hundred thirty-one thousand, two hundred thirty-one".