681515013 has 8 divisors (see below), whose sum is σ = 921485376. Its totient is φ = 447944000.

The previous prime is 681514991. The next prime is 681515017. The reversal of 681515013 is 310515186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681515013 - 2¹² = 681510917 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681515017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1599588 + ... + 1600013.

It is an arithmetic number, because the mean of its divisors is an integer number (115185672).

Almost surely, 2^681515013 is an apocalyptic number.

It is an amenable number.

681515013 is a deficient number, since it is larger than the sum of its proper divisors (239970363).

681515013 is a wasteful number, since it uses less digits than its factorization.

681515013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199675.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 681515013 is about 26105.8425069945. The cubic root of 681515013 is about 880.0185141594.

The spelling of 681515013 in words is "six hundred eighty-one million, five hundred fifteen thousand, thirteen".