19913138899 has 4 divisors (see below), whose sum is σ = 19914788520. Its totient is φ = 19911489280.

The previous prime is 19913138897. The next prime is 19913138909. The reversal of 19913138899 is 99883131991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99883131991 = 41 ⋅2436173951.

It is a cyclic number.

It is not a de Polignac number, because 19913138899 - 2¹ = 19913138897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19913138897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806569 + ... + 830890.

It is an arithmetic number, because the mean of its divisors is an integer number (4978697130).

Almost surely, 2^19913138899 is an apocalyptic number.

19913138899 is a deficient number, since it is larger than the sum of its proper divisors (1649621).

19913138899 is a wasteful number, since it uses less digits than its factorization.

19913138899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649620.

The product of its digits is 3779136, while the sum is 61.

The spelling of 19913138899 in words is "nineteen billion, nine hundred thirteen million, one hundred thirty-eight thousand, eight hundred ninety-nine".