27691187 has 2 divisors, whose sum is σ = 27691188. Its totient is φ = 27691186.

The previous prime is 27691117. The next prime is 27691199. The reversal of 27691187 is 78119672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27691187 - 2⁸ = 27690931 is a prime.

It is not a weakly prime, because it can be changed into another prime (27691117) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13845593 + 13845594.

It is an arithmetic number, because the mean of its divisors is an integer number (13845594).

Almost surely, 2^27691187 is an apocalyptic number.

27691187 is a deficient number, since it is larger than the sum of its proper divisors (1).

27691187 is an equidigital number, since it uses as much as digits as its factorization.

27691187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 27691187 is about 5262.2416326125. The cubic root of 27691187 is about 302.5384128075.

The spelling of 27691187 in words is "twenty-seven million, six hundred ninety-one thousand, one hundred eighty-seven".