681634525 has 24 divisors (see below), whose sum is σ = 992998944. Its totient is φ = 457598400.

The previous prime is 681634523. The next prime is 681634543. The reversal of 681634525 is 525436186.

681634525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681634525 - 2¹ = 681634523 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681634523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91759 + ... + 98908.

It is an arithmetic number, because the mean of its divisors is an integer number (41374956).

Almost surely, 2^681634525 is an apocalyptic number.

681634525 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

681634525 is a deficient number, since it is larger than the sum of its proper divisors (311364419).

681634525 is a wasteful number, since it uses less digits than its factorization.

681634525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190701 (or 190696 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The square root of 681634525 is about 26108.1313961762. The cubic root of 681634525 is about 880.0699518257.

The spelling of 681634525 in words is "six hundred eighty-one million, six hundred thirty-four thousand, five hundred twenty-five".