684831925 has 6 divisors (see below), whose sum is σ = 849191618. Its totient is φ = 547865520.

The previous prime is 684831911. The next prime is 684831937. The reversal of 684831925 is 529138486.

684831925 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 96963409 + 587868516 = 9847^2 + 24246^2 .

It is not a de Polignac number, because 684831925 - 2²⁵ = 651277493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13696614 + ... + 13696663.

Almost surely, 2^684831925 is an apocalyptic number.

It is an amenable number.

684831925 is a deficient number, since it is larger than the sum of its proper divisors (164359693).

684831925 is a wasteful number, since it uses less digits than its factorization.

684831925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27393287 (or 27393282 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 684831925 is about 26169.2935517946. The cubic root of 684831925 is about 881.4438783395.

The spelling of 684831925 in words is "six hundred eighty-four million, eight hundred thirty-one thousand, nine hundred twenty-five".