27810109 has 2 divisors, whose sum is σ = 27810110. Its totient is φ = 27810108.

The previous prime is 27810089. The next prime is 27810137. The reversal of 27810109 is 90101872.

It is an a-pointer prime, because the next prime (27810137) can be obtained adding 27810109 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15405625 + 12404484 = 3925^2 + 3522^2 .

It is a cyclic number.

It is not a de Polignac number, because 27810109 - 2⁵ = 27810077 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27810149) 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, 13905054 + 13905055.

It is an arithmetic number, because the mean of its divisors is an integer number (13905055).

Almost surely, 2^27810109 is an apocalyptic number.

It is an amenable number.

27810109 is a deficient number, since it is larger than the sum of its proper divisors (1).

27810109 is an equidigital number, since it uses as much as digits as its factorization.

27810109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 27810109 is about 5273.5290840195. The cubic root of 27810109 is about 302.9708860407.

The spelling of 27810109 in words is "twenty-seven million, eight hundred ten thousand, one hundred nine".