27918491 has 2 divisors, whose sum is σ = 27918492. Its totient is φ = 27918490.

The previous prime is 27918469. The next prime is 27918493. The reversal of 27918491 is 19481972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27918491 - 2⁶ = 27918427 is a prime.

Together with 27918493, 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 (27918493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13959245 + 13959246.

It is an arithmetic number, because the mean of its divisors is an integer number (13959246).

Almost surely, 2^27918491 is an apocalyptic number.

27918491 is a deficient number, since it is larger than the sum of its proper divisors (1).

27918491 is an equidigital number, since it uses as much as digits as its factorization.

27918491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 27918491 is about 5283.7951322889. The cubic root of 27918491 is about 303.3639568433.

The spelling of 27918491 in words is "twenty-seven million, nine hundred eighteen thousand, four hundred ninety-one".