681840525 has 12 divisors (see below), whose sum is σ = 1127309792. Its totient is φ = 363648240.

The previous prime is 681840503. The next prime is 681840529. The reversal of 681840525 is 525048186.

It is not a de Polignac number, because 681840525 - 2⁶ = 681840461 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 (681840529) 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 11 ways as a sum of consecutive naturals, for example, 4545529 + ... + 4545678.

Almost surely, 2^681840525 is an apocalyptic number.

It is an amenable number.

681840525 is a deficient number, since it is larger than the sum of its proper divisors (445469267).

681840525 is a wasteful number, since it uses less digits than its factorization.

681840525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9091220 (or 9091215 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 681840525 is about 26112.0762292086. The cubic root of 681840525 is about 880.1585995996.

The spelling of 681840525 in words is "six hundred eighty-one million, eight hundred forty thousand, five hundred twenty-five".