13331399 has 4 divisors (see below), whose sum is σ = 13481280. Its totient is φ = 13181520.

The previous prime is 13331309. The next prime is 13331411. The reversal of 13331399 is 99313331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99313331 = 13 ⋅7639487.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13331399 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 (13331309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74807 + ... + 74984.

It is an arithmetic number, because the mean of its divisors is an integer number (3370320).

Almost surely, 2^13331399 is an apocalyptic number.

13331399 is a deficient number, since it is larger than the sum of its proper divisors (149881).

13331399 is an equidigital number, since it uses as much as digits as its factorization.

13331399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149880.

The product of its digits is 6561, while the sum is 32.

The square root of 13331399 is about 3651.2188375938. The cubic root of 13331399 is about 237.1147527160.

The spelling of 13331399 in words is "thirteen million, three hundred thirty-one thousand, three hundred ninety-nine".