19038891381 has 4 divisors (see below), whose sum is σ = 25385188512. Its totient is φ = 12692594252.

The previous prime is 19038891373. The next prime is 19038891449. The reversal of 19038891381 is 18319883091.

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 19038891381 - 2³ = 19038891373 is a prime.

It is a super-2 number, since 2×19038891381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19038891341) 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, 3173148561 + ... + 3173148566.

It is an arithmetic number, because the mean of its divisors is an integer number (6346297128).

Almost surely, 2^19038891381 is an apocalyptic number.

It is an amenable number.

19038891381 is a deficient number, since it is larger than the sum of its proper divisors (6346297131).

19038891381 is an equidigital number, since it uses as much as digits as its factorization.

19038891381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6346297130.

The product of its (nonzero) digits is 373248, while the sum is 51.

The spelling of 19038891381 in words is "nineteen billion, thirty-eight million, eight hundred ninety-one thousand, three hundred eighty-one".