13131444399 has 4 divisors (see below), whose sum is σ = 17508592536. Its totient is φ = 8754296264.

The previous prime is 13131444373. The next prime is 13131444421. The reversal of 13131444399 is 99344413131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13131444399 - 2⁵ = 13131444367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13131444399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131444329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2188574064 + ... + 2188574069.

It is an arithmetic number, because the mean of its divisors is an integer number (4377148134).

Almost surely, 2^13131444399 is an apocalyptic number.

13131444399 is a deficient number, since it is larger than the sum of its proper divisors (4377148137).

13131444399 is an equidigital number, since it uses as much as digits as its factorization.

13131444399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4377148136.

The product of its digits is 139968, while the sum is 42.

The spelling of 13131444399 in words is "thirteen billion, one hundred thirty-one million, four hundred forty-four thousand, three hundred ninety-nine".