18914977091 has 2 divisors, whose sum is σ = 18914977092. Its totient is φ = 18914977090.

The previous prime is 18914977073. The next prime is 18914977093. The reversal of 18914977091 is 19077941981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18914977091 - 2³⁰ = 17841235267 is a prime.

Together with 18914977093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18914977093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457488545 + 9457488546.

It is an arithmetic number, because the mean of its divisors is an integer number (9457488546).

Almost surely, 2^18914977091 is an apocalyptic number.

18914977091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18914977091 is an equidigital number, since it uses as much as digits as its factorization.

18914977091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 56.

The spelling of 18914977091 in words is "eighteen billion, nine hundred fourteen million, nine hundred seventy-seven thousand, ninety-one".