13311729 has 8 divisors (see below), whose sum is σ = 19721120. Its totient is φ = 8874468.

The previous prime is 13311709. The next prime is 13311751. The reversal of 13311729 is 92711331.

It is not a de Polignac number, because 13311729 - 2⁹ = 13311217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 493027 = 13311729 / (1 + 3 + 3 + 1 + 1 + 7 + 2 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13311709) 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, 246487 + ... + 246540.

It is an arithmetic number, because the mean of its divisors is an integer number (2465140).

Almost surely, 2^13311729 is an apocalyptic number.

It is an amenable number.

13311729 is a deficient number, since it is larger than the sum of its proper divisors (6409391).

13311729 is an equidigital number, since it uses as much as digits as its factorization.

13311729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493036 (or 493030 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 13311729 is about 3648.5242222027. The cubic root of 13311729 is about 236.9980772156.

The spelling of 13311729 in words is "thirteen million, three hundred eleven thousand, seven hundred twenty-nine".