19319939989 has 4 divisors (see below), whose sum is σ = 22079931424. Its totient is φ = 16559948556.

The previous prime is 19319939987. The next prime is 19319940019. The reversal of 19319939989 is 98993991391.

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 19319939989 - 2¹ = 19319939987 is a prime.

It is a super-2 number, since 2×19319939989² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19319939987) 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, 1379995707 + ... + 1379995720.

It is an arithmetic number, because the mean of its divisors is an integer number (5519982856).

Almost surely, 2^19319939989 is an apocalyptic number.

It is an amenable number.

19319939989 is a deficient number, since it is larger than the sum of its proper divisors (2759991435).

19319939989 is an equidigital number, since it uses as much as digits as its factorization.

19319939989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2759991434.

The product of its digits is 38263752, while the sum is 70.

The spelling of 19319939989 in words is "nineteen billion, three hundred nineteen million, nine hundred thirty-nine thousand, nine hundred eighty-nine".