13231399 has 4 divisors (see below), whose sum is σ = 13455720. Its totient is φ = 13007080.

The previous prime is 13231373. The next prime is 13231411. The reversal of 13231399 is 99313231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99313231 = 89 ⋅1115879.

It is a cyclic number.

It is not a de Polignac number, because 13231399 - 2⁵ = 13231367 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13231399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231319) 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 in 3 ways as a sum of consecutive naturals, for example, 112072 + ... + 112189.

It is an arithmetic number, because the mean of its divisors is an integer number (3363930).

Almost surely, 2^13231399 is an apocalyptic number.

13231399 is a deficient number, since it is larger than the sum of its proper divisors (224321).

13231399 is an equidigital number, since it uses as much as digits as its factorization.

13231399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224320.

The product of its digits is 4374, while the sum is 31.

The square root of 13231399 is about 3637.4990034363. The cubic root of 13231399 is about 236.5203912172.

The spelling of 13231399 in words is "thirteen million, two hundred thirty-one thousand, three hundred ninety-nine".