27321989 has 2 divisors, whose sum is σ = 27321990. Its totient is φ = 27321988.

The previous prime is 27321971. The next prime is 27321991. The reversal of 27321989 is 98912372.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26697889 + 624100 = 5167^2 + 790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27321989 is a prime.

It is a super-2 number, since 2×27321989² = 1492982165832242, which contains 22 as substring.

Together with 27321991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27321089) 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, 13660994 + 13660995.

It is an arithmetic number, because the mean of its divisors is an integer number (13660995).

Almost surely, 2^27321989 is an apocalyptic number.

It is an amenable number.

27321989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27321989 is an equidigital number, since it uses as much as digits as its factorization.

27321989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 27321989 is about 5227.0440021106. The cubic root of 27321989 is about 301.1878424124.

The spelling of 27321989 in words is "twenty-seven million, three hundred twenty-one thousand, nine hundred eighty-nine".