13115681 has 8 divisors (see below), whose sum is σ = 14406720. Its totient is φ = 11884752.

The previous prime is 13115677. The next prime is 13115693. The reversal of 13115681 is 18651131.

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 13115681 - 2² = 13115677 is a prime.

It is a super-2 number, since 2×13115681² = 344042176187522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13115681.

It is not an unprimeable number, because it can be changed into a prime (13115611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14570 + ... + 15443.

It is an arithmetic number, because the mean of its divisors is an integer number (1800840).

Almost surely, 2^13115681 is an apocalyptic number.

It is an amenable number.

13115681 is a deficient number, since it is larger than the sum of its proper divisors (1291039).

13115681 is a wasteful number, since it uses less digits than its factorization.

13115681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30055.

The product of its digits is 720, while the sum is 26.

The square root of 13115681 is about 3621.5578139801. The cubic root of 13115681 is about 235.8288582546.

The spelling of 13115681 in words is "thirteen million, one hundred fifteen thousand, six hundred eighty-one".