681507915 has 32 divisors (see below), whose sum is σ = 1192320000. Its totient is φ = 329656320.

The previous prime is 681507901. The next prime is 681507919. The reversal of 681507915 is 519705186.

It is not a de Polignac number, because 681507915 - 2⁴ = 681507899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681507919) 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 31 ways as a sum of consecutive naturals, for example, 69486 + ... + 78684.

It is an arithmetic number, because the mean of its divisors is an integer number (37260000).

Almost surely, 2^681507915 is an apocalyptic number.

681507915 is a deficient number, since it is larger than the sum of its proper divisors (510812085).

681507915 is a wasteful number, since it uses less digits than its factorization.

681507915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9667.

The product of its (nonzero) digits is 75600, while the sum is 42.

The square root of 681507915 is about 26105.7065600608. The cubic root of 681507915 is about 880.0154590087.

The spelling of 681507915 in words is "six hundred eighty-one million, five hundred seven thousand, nine hundred fifteen".