19138612893 has 4 divisors (see below), whose sum is σ = 25518150528. Its totient is φ = 12759075260.

The previous prime is 19138612849. The next prime is 19138612907. The reversal of 19138612893 is 39821683191.

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 19138612893 - 2¹⁴ = 19138596509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19138612813) 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, 3189768813 + ... + 3189768818.

It is an arithmetic number, because the mean of its divisors is an integer number (6379537632).

Almost surely, 2^19138612893 is an apocalyptic number.

It is an amenable number.

19138612893 is a deficient number, since it is larger than the sum of its proper divisors (6379537635).

19138612893 is an equidigital number, since it uses as much as digits as its factorization.

19138612893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6379537634.

The product of its digits is 559872, while the sum is 51.

The spelling of 19138612893 in words is "nineteen billion, one hundred thirty-eight million, six hundred twelve thousand, eight hundred ninety-three".