13015681 has 8 divisors (see below), whose sum is σ = 15079424. Its totient is φ = 11003040.

The previous prime is 13015669. The next prime is 13015721. The reversal of 13015681 is 18651031.

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 13015681 - 2¹⁹ = 12491393 is a prime.

It is a super-2 number, since 2×13015681² = 338815903787522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13015181) 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, 12225 + ... + 13246.

It is an arithmetic number, because the mean of its divisors is an integer number (1884928).

Almost surely, 2^13015681 is an apocalyptic number.

It is an amenable number.

13015681 is a deficient number, since it is larger than the sum of its proper divisors (2063743).

13015681 is an equidigital number, since it uses as much as digits as its factorization.

13015681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25551.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 13015681 is about 3607.7251835471. The cubic root of 13015681 is about 235.2279725261.

The spelling of 13015681 in words is "thirteen million, fifteen thousand, six hundred eighty-one".