13181905913 has 4 divisors (see below), whose sum is σ = 14380261008. Its totient is φ = 11983550820.

The previous prime is 13181905903. The next prime is 13181905921. The reversal of 13181905913 is 31950918131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13181905913 - 2⁸ = 13181905657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13181905903) 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, 599177531 + ... + 599177552.

It is an arithmetic number, because the mean of its divisors is an integer number (3595065252).

Almost surely, 2^13181905913 is an apocalyptic number.

It is an amenable number.

13181905913 is a deficient number, since it is larger than the sum of its proper divisors (1198355095).

13181905913 is a wasteful number, since it uses less digits than its factorization.

13181905913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198355094.

The product of its (nonzero) digits is 29160, while the sum is 41.

The spelling of 13181905913 in words is "thirteen billion, one hundred eighty-one million, nine hundred five thousand, nine hundred thirteen".