686910131 has 2 divisors, whose sum is σ = 686910132. Its totient is φ = 686910130.

The previous prime is 686910089. The next prime is 686910151. The reversal of 686910131 is 131019686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686910131 is a prime.

It is a super-2 number, since 2×686910131² = 943691056140874322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 686910091 and 686910100.

It is not a weakly prime, because it can be changed into another prime (686910151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343455065 + 343455066.

It is an arithmetic number, because the mean of its divisors is an integer number (343455066).

Almost surely, 2^686910131 is an apocalyptic number.

686910131 is a deficient number, since it is larger than the sum of its proper divisors (1).

686910131 is an equidigital number, since it uses as much as digits as its factorization.

686910131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 686910131 is about 26208.9704299883. The cubic root of 686910131 is about 882.3345942680.

The spelling of 686910131 in words is "six hundred eighty-six million, nine hundred ten thousand, one hundred thirty-one".