681942825 has 18 divisors (see below), whose sum is σ = 1221435774. Its totient is φ = 363702720.

The previous prime is 681942823. The next prime is 681942829. The reversal of 681942825 is 528249186.

681942825 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 197458704 + 484484121 = 14052^2 + 22011^2 .

It is not a de Polignac number, because 681942825 - 2¹ = 681942823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (681942823) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1515204 + ... + 1515653.

It is an arithmetic number, because the mean of its divisors is an integer number (67857543).

Almost surely, 2^681942825 is an apocalyptic number.

It is an amenable number.

681942825 is a deficient number, since it is larger than the sum of its proper divisors (539492949).

681942825 is a wasteful number, since it uses less digits than its factorization.

681942825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030873 (or 3030865 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 681942825 is about 26114.0350195063. The cubic root of 681942825 is about 880.2026156214.

The spelling of 681942825 in words is "six hundred eighty-one million, nine hundred forty-two thousand, eight hundred twenty-five".