13018681 has 8 divisors (see below), whose sum is σ = 14250824. Its totient is φ = 11819520.

The previous prime is 13018679. The next prime is 13018697. The reversal of 13018681 is 18681031.

It is a happy number.

13018681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 705600 + 12313081 = 840^2 + 3509^2 .

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 13018681 - 2¹ = 13018679 is a prime.

It is a super-2 number, since 2×13018681² = 338972109959522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13018081) 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, 7416 + ... + 9001.

It is an arithmetic number, because the mean of its divisors is an integer number (1781353).

Almost surely, 2^13018681 is an apocalyptic number.

It is an amenable number.

13018681 is a deficient number, since it is larger than the sum of its proper divisors (1232143).

13018681 is a wasteful number, since it uses less digits than its factorization.

13018681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16491.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 13018681 is about 3608.1409340545. The cubic root of 13018681 is about 235.2460437974.

The spelling of 13018681 in words is "thirteen million, eighteen thousand, six hundred eighty-one".