685312901 has 8 divisors (see below), whose sum is σ = 843462144. Its totient is φ = 542225520.

The previous prime is 685312871. The next prime is 685312933. The reversal of 685312901 is 109213586.

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 685312901 - 2¹⁰ = 685311877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685312981) 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 7 ways as a sum of consecutive naturals, for example, 3765365 + ... + 3765546.

It is an arithmetic number, because the mean of its divisors is an integer number (105432768).

Almost surely, 2^685312901 is an apocalyptic number.

It is an amenable number.

685312901 is a deficient number, since it is larger than the sum of its proper divisors (158149243).

685312901 is a wasteful number, since it uses less digits than its factorization.

685312901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7530931.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 685312901 is about 26178.4816404619. The cubic root of 685312901 is about 881.6501840148.

The spelling of 685312901 in words is "six hundred eighty-five million, three hundred twelve thousand, nine hundred one".