27980111 has 2 divisors, whose sum is σ = 27980112. Its totient is φ = 27980110.

The previous prime is 27980083. The next prime is 27980119. The reversal of 27980111 is 11108972.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27980111 is a prime.

It is a super-2 number, since 2×27980111² = 1565773223144642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27980119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13990055 + 13990056.

It is an arithmetic number, because the mean of its divisors is an integer number (13990056).

Almost surely, 2^27980111 is an apocalyptic number.

27980111 is a deficient number, since it is larger than the sum of its proper divisors (1).

27980111 is an equidigital number, since it uses as much as digits as its factorization.

27980111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 27980111 is about 5289.6229544269. The cubic root of 27980111 is about 303.5869816833.

The spelling of 27980111 in words is "twenty-seven million, nine hundred eighty thousand, one hundred eleven".