27771109 has 2 divisors, whose sum is σ = 27771110. Its totient is φ = 27771108.

The previous prime is 27771091. The next prime is 27771119. The reversal of 27771109 is 90117772.

Together with previous prime (27771091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27531009 + 240100 = 5247^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 27771109 - 2¹⁵ = 27738341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27771119) 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, 13885554 + 13885555.

It is an arithmetic number, because the mean of its divisors is an integer number (13885555).

Almost surely, 2^27771109 is an apocalyptic number.

It is an amenable number.

27771109 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771109 is an equidigital number, since it uses as much as digits as its factorization.

27771109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6174, while the sum is 34.

The square root of 27771109 is about 5269.8300731618. The cubic root of 27771109 is about 302.8291942521.

The spelling of 27771109 in words is "twenty-seven million, seven hundred seventy-one thousand, one hundred nine".