685496137 has 2 divisors, whose sum is σ = 685496138. Its totient is φ = 685496136.

The previous prime is 685496131. The next prime is 685496159. The reversal of 685496137 is 731694586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632220736 + 53275401 = 25144^2 + 7299^2 .

It is a cyclic number.

It is not a de Polignac number, because 685496137 - 2³ = 685496129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (685496131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342748068 + 342748069.

It is an arithmetic number, because the mean of its divisors is an integer number (342748069).

Almost surely, 2^685496137 is an apocalyptic number.

It is an amenable number.

685496137 is a deficient number, since it is larger than the sum of its proper divisors (1).

685496137 is an equidigital number, since it uses as much as digits as its factorization.

685496137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 49.

The square root of 685496137 is about 26181.9811511658. The cubic root of 685496137 is about 881.7287542838.

The spelling of 685496137 in words is "six hundred eighty-five million, four hundred ninety-six thousand, one hundred thirty-seven".