685157 has 8 divisors (see below), whose sum is σ = 753600. Its totient is φ = 617760.

The previous prime is 685141. The next prime is 685169. The reversal of 685157 is 751586.

685157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 685157 - 2⁴ = 685141 is a prime.

It is a super-2 number, since 2×685157² = 938880229298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 2033 + ... + 2345.

It is an arithmetic number, because the mean of its divisors is an integer number (94200).

2⁶⁸⁵¹⁵⁷ is an apocalyptic number.

It is an amenable number.

685157 is a deficient number, since it is larger than the sum of its proper divisors (68443).

685157 is a wasteful number, since it uses less digits than its factorization.

685157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its digits is 8400, while the sum is 32.

The square root of 685157 is about 827.7421095969. The cubic root of 685157 is about 88.1583323768.

It can be divided in two parts, 68 and 5157, that added together give a palindrome (5225).

The spelling of 685157 in words is "six hundred eighty-five thousand, one hundred fifty-seven".