685914157 has 4 divisors (see below), whose sum is σ = 686490300. Its totient is φ = 685338016.

The previous prime is 685914149. The next prime is 685914167. The reversal of 685914157 is 751419586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 255808036 + 430106121 = 15994^2 + 20739^2 .

It is a cyclic number.

It is not a de Polignac number, because 685914157 - 2³ = 685914149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685914107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286282 + ... + 288667.

It is an arithmetic number, because the mean of its divisors is an integer number (171622575).

Almost surely, 2^685914157 is an apocalyptic number.

It is an amenable number.

685914157 is a deficient number, since it is larger than the sum of its proper divisors (576143).

685914157 is a wasteful number, since it uses less digits than its factorization.

685914157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576142.

The product of its digits is 302400, while the sum is 46.

The square root of 685914157 is about 26189.9629056629. The cubic root of 685914157 is about 881.9079458399.

The spelling of 685914157 in words is "six hundred eighty-five million, nine hundred fourteen thousand, one hundred fifty-seven".