686323831 has 16 divisors (see below), whose sum is σ = 719267040. Its totient is φ = 654062080.

The previous prime is 686323829. The next prime is 686323837. The reversal of 686323831 is 138323686.

It is a cyclic number.

It is not a de Polignac number, because 686323831 - 2¹ = 686323829 is a prime.

It is a super-2 number, since 2×686323831² = 942080801997033122, 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 (686323837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 901491 + ... + 902251.

It is an arithmetic number, because the mean of its divisors is an integer number (44954190).

Almost surely, 2^686323831 is an apocalyptic number.

686323831 is a deficient number, since it is larger than the sum of its proper divisors (32943209).

686323831 is a wasteful number, since it uses less digits than its factorization.

686323831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154.

The product of its digits is 124416, while the sum is 40.

The square root of 686323831 is about 26197.7829405467. The cubic root of 686323831 is about 882.0834891136.

The spelling of 686323831 in words is "six hundred eighty-six million, three hundred twenty-three thousand, eight hundred thirty-one".