18889927291 has 2 divisors, whose sum is σ = 18889927292. Its totient is φ = 18889927290.

The previous prime is 18889927249. The next prime is 18889927321. The reversal of 18889927291 is 19272998881.

It is a strong prime.

It is an emirp because it is prime and its reverse (19272998881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18889927291 - 2¹⁹ = 18889403003 is a prime.

It is not a weakly prime, because it can be changed into another prime (18889927691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9444963645 + 9444963646.

It is an arithmetic number, because the mean of its divisors is an integer number (9444963646).

Almost surely, 2^18889927291 is an apocalyptic number.

18889927291 is a deficient number, since it is larger than the sum of its proper divisors (1).

18889927291 is an equidigital number, since it uses as much as digits as its factorization.

18889927291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 64.

The spelling of 18889927291 in words is "eighteen billion, eight hundred eighty-nine million, nine hundred twenty-seven thousand, two hundred ninety-one".