19139109797 has 4 divisors (see below), whose sum is σ = 19139481120. Its totient is φ = 19138738476.

The previous prime is 19139109757. The next prime is 19139109823. The reversal of 19139109797 is 79790193191.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79790193191 = 823 ⋅96950417.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19139109797 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 (19139109707) 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, 92897 + ... + 216582.

It is an arithmetic number, because the mean of its divisors is an integer number (4784870280).

Almost surely, 2^19139109797 is an apocalyptic number.

It is an amenable number.

19139109797 is a deficient number, since it is larger than the sum of its proper divisors (371323).

19139109797 is an equidigital number, since it uses as much as digits as its factorization.

19139109797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371322.

The product of its (nonzero) digits is 964467, while the sum is 56.

The spelling of 19139109797 in words is "nineteen billion, one hundred thirty-nine million, one hundred nine thousand, seven hundred ninety-seven".