27289991 has 2 divisors, whose sum is σ = 27289992. Its totient is φ = 27289990.

The previous prime is 27289987. The next prime is 27290017. The reversal of 27289991 is 19998272.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27289991 - 2² = 27289987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27289901) 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, 13644995 + 13644996.

It is an arithmetic number, because the mean of its divisors is an integer number (13644996).

Almost surely, 2^27289991 is an apocalyptic number.

27289991 is a deficient number, since it is larger than the sum of its proper divisors (1).

27289991 is an equidigital number, since it uses as much as digits as its factorization.

27289991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 27289991 is about 5223.9822932319. The cubic root of 27289991 is about 301.0702183100.

The spelling of 27289991 in words is "twenty-seven million, two hundred eighty-nine thousand, nine hundred ninety-one".