13579681 has 2 divisors, whose sum is σ = 13579682. Its totient is φ = 13579680.

The previous prime is 13579669. The next prime is 13579697. The reversal of 13579681 is 18697531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13432225 + 147456 = 3665^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 13579681 - 2⁵ = 13579649 is a prime.

It is a super-2 number, since 2×13579681² = 368815472123522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13579781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6789840 + 6789841.

It is an arithmetic number, because the mean of its divisors is an integer number (6789841).

Almost surely, 2^13579681 is an apocalyptic number.

It is an amenable number.

13579681 is a deficient number, since it is larger than the sum of its proper divisors (1).

13579681 is an equidigital number, since it uses as much as digits as its factorization.

13579681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 13579681 is about 3685.0618719365. The cubic root of 13579681 is about 238.5777046989.

The spelling of 13579681 in words is "thirteen million, five hundred seventy-nine thousand, six hundred eighty-one".