686051731 has 8 divisors (see below), whose sum is σ = 708524928. Its totient is φ = 663600000.

The previous prime is 686051701. The next prime is 686051747. The reversal of 686051731 is 137150686.

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 686051731 - 2⁷ = 686051603 is a prime.

It is a super-2 number, since 2×686051731² = 941333955216192722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686051701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82881 + ... + 90781.

It is an arithmetic number, because the mean of its divisors is an integer number (88565616).

Almost surely, 2^686051731 is an apocalyptic number.

686051731 is a deficient number, since it is larger than the sum of its proper divisors (22473197).

686051731 is a wasteful number, since it uses less digits than its factorization.

686051731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10733.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 686051731 is about 26192.5892381796. The cubic root of 686051731 is about 881.9669034086.

The spelling of 686051731 in words is "six hundred eighty-six million, fifty-one thousand, seven hundred thirty-one".