27171689 has 2 divisors, whose sum is σ = 27171690. Its totient is φ = 27171688.

The previous prime is 27171667. The next prime is 27171701. The reversal of 27171689 is 98617172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25928464 + 1243225 = 5092^2 + 1115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27171689 is a prime.

It is a super-2 number, since 2×27171689² = 1476601366225442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27171589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13585844 + 13585845.

It is an arithmetic number, because the mean of its divisors is an integer number (13585845).

Almost surely, 2^27171689 is an apocalyptic number.

It is an amenable number.

27171689 is a deficient number, since it is larger than the sum of its proper divisors (1).

27171689 is an equidigital number, since it uses as much as digits as its factorization.

27171689 is an odious number, because the sum of its binary digits is odd.

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

The square root of 27171689 is about 5212.6470243054. The cubic root of 27171689 is about 300.6345420933.

The spelling of 27171689 in words is "twenty-seven million, one hundred seventy-one thousand, six hundred eighty-nine".