19138890813 has 32 divisors (see below), whose sum is σ = 29576275200. Its totient is φ = 10782621696.

The previous prime is 19138890809. The next prime is 19138890833. The reversal of 19138890813 is 31809883191.

It is not a de Polignac number, because 19138890813 - 2² = 19138890809 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19138890833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 645253 + ... + 674261.

It is an arithmetic number, because the mean of its divisors is an integer number (924258600).

Almost surely, 2^19138890813 is an apocalyptic number.

It is an amenable number.

19138890813 is a deficient number, since it is larger than the sum of its proper divisors (10437384387).

19138890813 is a wasteful number, since it uses less digits than its factorization.

19138890813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29461.

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

The spelling of 19138890813 in words is "nineteen billion, one hundred thirty-eight million, eight hundred ninety thousand, eight hundred thirteen".