27661189 has 2 divisors, whose sum is σ = 27661190. Its totient is φ = 27661188.

The previous prime is 27661187. The next prime is 27661211. The reversal of 27661189 is 98116672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26440164 + 1221025 = 5142^2 + 1105^2 .

It is a cyclic number.

It is not a de Polignac number, because 27661189 - 2¹ = 27661187 is a prime.

Together with 27661187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27661187) 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, 13830594 + 13830595.

It is an arithmetic number, because the mean of its divisors is an integer number (13830595).

Almost surely, 2^27661189 is an apocalyptic number.

It is an amenable number.

27661189 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661189 is an equidigital number, since it uses as much as digits as its factorization.

27661189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 27661189 is about 5259.3905540471. The cubic root of 27661189 is about 302.4291262141.

The spelling of 27661189 in words is "twenty-seven million, six hundred sixty-one thousand, one hundred eighty-nine".