27661187 has 2 divisors, whose sum is σ = 27661188. Its totient is φ = 27661186.

The previous prime is 27661171. The next prime is 27661189. The reversal of 27661187 is 78116672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27661187 - 2⁴ = 27661171 is a prime.

Together with 27661189, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27661187.

It is not a weakly prime, because it can be changed into another prime (27661189) 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, 13830593 + 13830594.

It is an arithmetic number, because the mean of its divisors is an integer number (13830594).

Almost surely, 2^27661187 is an apocalyptic number.

27661187 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661187 is an equidigital number, since it uses as much as digits as its factorization.

27661187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 38.

The square root of 27661187 is about 5259.3903639110. The cubic root of 27661187 is about 302.4291189253.

The spelling of 27661187 in words is "twenty-seven million, six hundred sixty-one thousand, one hundred eighty-seven".