19394909091 has 24 divisors (see below), whose sum is σ = 30771486720. Its totient is φ = 11716830576.

The previous prime is 19394909077. The next prime is 19394909113. The reversal of 19394909091 is 19090949391.

It is not a de Polignac number, because 19394909091 - 2¹⁵ = 19394876323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19394909021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2461731 + ... + 2469596.

It is an arithmetic number, because the mean of its divisors is an integer number (1282145280).

Almost surely, 2^19394909091 is an apocalyptic number.

19394909091 is a deficient number, since it is larger than the sum of its proper divisors (11376577629).

19394909091 is a wasteful number, since it uses less digits than its factorization.

19394909091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4931375 (or 4931372 counting only the distinct ones).

The product of its (nonzero) digits is 708588, while the sum is 54.

The spelling of 19394909091 in words is "nineteen billion, three hundred ninety-four million, nine hundred nine thousand, ninety-one".