19090919171 has 2 divisors, whose sum is σ = 19090919172. Its totient is φ = 19090919170.

The previous prime is 19090919167. The next prime is 19090919179. The reversal of 19090919171 is 17191909091.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19090919171 - 2² = 19090919167 is a prime.

It is not a weakly prime, because it can be changed into another prime (19090919179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9545459585 + 9545459586.

It is an arithmetic number, because the mean of its divisors is an integer number (9545459586).

Almost surely, 2^19090919171 is an apocalyptic number.

19090919171 is a deficient number, since it is larger than the sum of its proper divisors (1).

19090919171 is an equidigital number, since it uses as much as digits as its factorization.

19090919171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927, while the sum is 47.

The spelling of 19090919171 in words is "nineteen billion, ninety million, nine hundred nineteen thousand, one hundred seventy-one".