681547625 has 24 divisors (see below), whose sum is σ = 934946376. Its totient is φ = 495660000.

The previous prime is 681547621. The next prime is 681547649. The reversal of 681547625 is 526745186.

It can be written as a sum of positive squares in 4 ways, for example, as 755161 + 680792464 = 869^2 + 26092^2 .

It is not a de Polignac number, because 681547625 - 2² = 681547621 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 (681547621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7406 + ... + 37655.

It is an arithmetic number, because the mean of its divisors is an integer number (38956099).

Almost surely, 2^681547625 is an apocalyptic number.

It is an amenable number.

681547625 is a deficient number, since it is larger than the sum of its proper divisors (253398751).

681547625 is a wasteful number, since it uses less digits than its factorization.

681547625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45098 (or 45077 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The square root of 681547625 is about 26106.4671106605. The cubic root of 681547625 is about 880.0325508793.

The spelling of 681547625 in words is "six hundred eighty-one million, five hundred forty-seven thousand, six hundred twenty-five".