27291791 has 2 divisors, whose sum is σ = 27291792. Its totient is φ = 27291790.

The previous prime is 27291787. The next prime is 27291793. The reversal of 27291791 is 19719272.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27291791 - 2² = 27291787 is a prime.

Together with 27291793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27291793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13645895 + 13645896.

It is an arithmetic number, because the mean of its divisors is an integer number (13645896).

Almost surely, 2^27291791 is an apocalyptic number.

27291791 is a deficient number, since it is larger than the sum of its proper divisors (1).

27291791 is an equidigital number, since it uses as much as digits as its factorization.

27291791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 38.

The square root of 27291791 is about 5224.1545727515. The cubic root of 27291791 is about 301.0768375192.

It can be divided in two parts, 27291 and 791, that added together give a palindrome (28082).

The spelling of 27291791 in words is "twenty-seven million, two hundred ninety-one thousand, seven hundred ninety-one".