686838131 has 8 divisors (see below), whose sum is σ = 831132000. Its totient is φ = 554087808.

The previous prime is 686838083. The next prime is 686838133. The reversal of 686838131 is 131838686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686838131 is a prime.

It is a super-2 number, since 2×686838131² = 943493236391146322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686838133) 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, 2885756 + ... + 2885993.

It is an arithmetic number, because the mean of its divisors is an integer number (103891500).

Almost surely, 2^686838131 is an apocalyptic number.

686838131 is a deficient number, since it is larger than the sum of its proper divisors (144293869).

686838131 is a wasteful number, since it uses less digits than its factorization.

686838131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5771773.

The product of its digits is 165888, while the sum is 44.

The square root of 686838131 is about 26207.5968184799. The cubic root of 686838131 is about 882.3037652422.

The spelling of 686838131 in words is "six hundred eighty-six million, eight hundred thirty-eight thousand, one hundred thirty-one".