27455891 has 2 divisors, whose sum is σ = 27455892. Its totient is φ = 27455890.

The previous prime is 27455873. The next prime is 27455903. The reversal of 27455891 is 19855472.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27455891 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27455851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13727945 + 13727946.

It is an arithmetic number, because the mean of its divisors is an integer number (13727946).

Almost surely, 2^27455891 is an apocalyptic number.

27455891 is a deficient number, since it is larger than the sum of its proper divisors (1).

27455891 is an equidigital number, since it uses as much as digits as its factorization.

27455891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 41.

The square root of 27455891 is about 5239.8369249434. The cubic root of 27455891 is about 301.6790700651.

It can be divided in two parts, 274 and 55891, that added together give a palindrome (56165).

The spelling of 27455891 in words is "twenty-seven million, four hundred fifty-five thousand, eight hundred ninety-one".