13685257 has 2 divisors, whose sum is σ = 13685258. Its totient is φ = 13685256.

The previous prime is 13685251. The next prime is 13685279. The reversal of 13685257 is 75258631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 1498176 = 3491^2 + 1224^2 .

It is a cyclic number.

It is not a de Polignac number, because 13685257 - 2¹⁹ = 13160969 is a prime.

It is not a weakly prime, because it can be changed into another prime (13685251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6842628 + 6842629.

It is an arithmetic number, because the mean of its divisors is an integer number (6842629).

Almost surely, 2^13685257 is an apocalyptic number.

It is an amenable number.

13685257 is a deficient number, since it is larger than the sum of its proper divisors (1).

13685257 is an equidigital number, since it uses as much as digits as its factorization.

13685257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 13685257 is about 3699.3589985293. The cubic root of 13685257 is about 239.1943879345.

The spelling of 13685257 in words is "thirteen million, six hundred eighty-five thousand, two hundred fifty-seven".