19891914271 has 2 divisors, whose sum is σ = 19891914272. Its totient is φ = 19891914270.

The previous prime is 19891914247. The next prime is 19891914307. The reversal of 19891914271 is 17241919891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19891914271 - 2⁷ = 19891914143 is a prime.

It is a super-2 number, since 2×19891914271² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19891914221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9945957135 + 9945957136.

It is an arithmetic number, because the mean of its divisors is an integer number (9945957136).

Almost surely, 2^19891914271 is an apocalyptic number.

19891914271 is a deficient number, since it is larger than the sum of its proper divisors (1).

19891914271 is an equidigital number, since it uses as much as digits as its factorization.

19891914271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 52.

The spelling of 19891914271 in words is "nineteen billion, eight hundred ninety-one million, nine hundred fourteen thousand, two hundred seventy-one".