18192819091 has 2 divisors, whose sum is σ = 18192819092. Its totient is φ = 18192819090.

The previous prime is 18192819089. The next prime is 18192819097. The reversal of 18192819091 is 19091829181.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18192819091 - 2¹ = 18192819089 is a prime.

Together with 18192819089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18192819097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9096409545 + 9096409546.

It is an arithmetic number, because the mean of its divisors is an integer number (9096409546).

Almost surely, 2^18192819091 is an apocalyptic number.

18192819091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18192819091 is an equidigital number, since it uses as much as digits as its factorization.

18192819091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 49.

The spelling of 18192819091 in words is "eighteen billion, one hundred ninety-two million, eight hundred nineteen thousand, ninety-one".