686511331 has 8 divisors (see below), whose sum is σ = 749402928. Its totient is φ = 623700000.

The previous prime is 686511311. The next prime is 686511373. The reversal of 686511331 is 133115686.

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

It is not a de Polignac number, because 686511331 - 2⁵ = 686511299 is a prime.

It is a super-2 number, since 2×686511331² = 942595615182783122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686511311) 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, 1420 + ... + 37081.

It is an arithmetic number, because the mean of its divisors is an integer number (93675366).

Almost surely, 2^686511331 is an apocalyptic number.

686511331 is a deficient number, since it is larger than the sum of its proper divisors (62891597).

686511331 is a wasteful number, since it uses less digits than its factorization.

686511331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40133.

The product of its digits is 12960, while the sum is 34.

The square root of 686511331 is about 26201.3612432637. The cubic root of 686511331 is about 882.1638086303.

It can be divided in two parts, 68651 and 1331, that multiplied together give a square (91374481 = 9559²).

The spelling of 686511331 in words is "six hundred eighty-six million, five hundred eleven thousand, three hundred thirty-one".