13819975991 has 4 divisors (see below), whose sum is σ = 13821446184. Its totient is φ = 13818505800.

The previous prime is 13819975957. The next prime is 13819975997. The reversal of 13819975991 is 19957991831.

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 13819975991 - 2¹⁰ = 13819974967 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 (13819975997) 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, 720905 + ... + 739826.

It is an arithmetic number, because the mean of its divisors is an integer number (3455361546).

Almost surely, 2^13819975991 is an apocalyptic number.

13819975991 is a deficient number, since it is larger than the sum of its proper divisors (1470193).

13819975991 is an equidigital number, since it uses as much as digits as its factorization.

13819975991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470192.

The product of its digits is 5511240, while the sum is 62.

The spelling of 13819975991 in words is "thirteen billion, eight hundred nineteen million, nine hundred seventy-five thousand, nine hundred ninety-one".