27198869 has 2 divisors, whose sum is σ = 27198870. Its totient is φ = 27198868.

The previous prime is 27198841. The next prime is 27198881. The reversal of 27198869 is 96889172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25623844 + 1575025 = 5062^2 + 1255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27198869 is a prime.

It is a super-2 number, since 2×27198869² = 1479556949758322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27198889) 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, 13599434 + 13599435.

It is an arithmetic number, because the mean of its divisors is an integer number (13599435).

Almost surely, 2^27198869 is an apocalyptic number.

It is an amenable number.

27198869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27198869 is an equidigital number, since it uses as much as digits as its factorization.

27198869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 50.

The square root of 27198869 is about 5215.2534933596. The cubic root of 27198869 is about 300.7347508533.

The spelling of 27198869 in words is "twenty-seven million, one hundred ninety-eight thousand, eight hundred sixty-nine".