27711997 has 2 divisors, whose sum is σ = 27711998. Its totient is φ = 27711996.

The previous prime is 27711991. The next prime is 27712021. The reversal of 27711997 is 79911772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23755876 + 3956121 = 4874^2 + 1989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27711997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27711991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13855998 + 13855999.

It is an arithmetic number, because the mean of its divisors is an integer number (13855999).

Almost surely, 2^27711997 is an apocalyptic number.

It is an amenable number.

27711997 is a deficient number, since it is larger than the sum of its proper divisors (1).

27711997 is an equidigital number, since it uses as much as digits as its factorization.

27711997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55566, while the sum is 43.

The square root of 27711997 is about 5264.2185554933. The cubic root of 27711997 is about 302.6141799690.

The spelling of 27711997 in words is "twenty-seven million, seven hundred eleven thousand, nine hundred ninety-seven".