13681309 has 4 divisors (see below), whose sum is σ = 13696704. Its totient is φ = 13665916.

The previous prime is 13681303. The next prime is 13681313. The reversal of 13681309 is 90318631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13681309 - 2¹⁵ = 13648541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13681303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6277 + ... + 8170.

It is an arithmetic number, because the mean of its divisors is an integer number (3424176).

Almost surely, 2^13681309 is an apocalyptic number.

It is an amenable number.

13681309 is a deficient number, since it is larger than the sum of its proper divisors (15395).

13681309 is an equidigital number, since it uses as much as digits as its factorization.

13681309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15394.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 13681309 is about 3698.8253540820. The cubic root of 13681309 is about 239.1713843409.

The spelling of 13681309 in words is "thirteen million, six hundred eighty-one thousand, three hundred nine".