685137 has 8 divisors (see below), whose sum is σ = 920736. Its totient is φ = 453152.

The previous prime is 685123. The next prime is 685141. The reversal of 685137 is 731586.

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 685137 - 2⁶ = 685073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685177) 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, 423 + ... + 1244.

It is an arithmetic number, because the mean of its divisors is an integer number (115092).

2⁶⁸⁵¹³⁷ is an apocalyptic number.

It is an amenable number.

685137 is a deficient number, since it is larger than the sum of its proper divisors (235599).

685137 is a wasteful number, since it uses less digits than its factorization.

685137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807.

The product of its digits is 5040, while the sum is 30.

The square root of 685137 is about 827.7300284513. The cubic root of 685137 is about 88.1574745764.

The spelling of 685137 in words is "six hundred eighty-five thousand, one hundred thirty-seven".