681413515 has 4 divisors (see below), whose sum is σ = 817696224. Its totient is φ = 545130808.

The previous prime is 681413503. The next prime is 681413539. The reversal of 681413515 is 515314186.

681413515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681413515 - 2²³ = 673024907 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68141347 + ... + 68141356.

It is an arithmetic number, because the mean of its divisors is an integer number (204424056).

Almost surely, 2^681413515 is an apocalyptic number.

681413515 is a deficient number, since it is larger than the sum of its proper divisors (136282709).

681413515 is a wasteful number, since it uses less digits than its factorization.

681413515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136282708.

The product of its digits is 14400, while the sum is 34.

The square root of 681413515 is about 26103.8984636395. The cubic root of 681413515 is about 879.9748249513.

The spelling of 681413515 in words is "six hundred eighty-one million, four hundred thirteen thousand, five hundred fifteen".