19191091092 has 24 divisors (see below), whose sum is σ = 45820590816. Its totient is φ = 6248262048.

The previous prime is 19191091091. The next prime is 19191091097. The reversal of 19191091092 is 29019019191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19191091091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18595503 + ... + 18596534.

It is an arithmetic number, because the mean of its divisors is an integer number (1909191284).

Almost surely, 2^19191091092 is an apocalyptic number.

19191091092 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19191091092 is an abundant number, since it is smaller than the sum of its proper divisors (26629499724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19191091092 is a wasteful number, since it uses less digits than its factorization.

19191091092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37192087 (or 37192085 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 42.

The spelling of 19191091092 in words is "nineteen billion, one hundred ninety-one million, ninety-one thousand, ninety-two".