27710981 has 2 divisors, whose sum is σ = 27710982. Its totient is φ = 27710980.

The previous prime is 27710959. The next prime is 27711001. The reversal of 27710981 is 18901772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26728900 + 982081 = 5170^2 + 991^2 .

It is a cyclic number.

It is not a de Polignac number, because 27710981 - 2²² = 23516677 is a prime.

It is a super-2 number, since 2×27710981² = 1535796935964722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27710941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13855490 + 13855491.

It is an arithmetic number, because the mean of its divisors is an integer number (13855491).

Almost surely, 2^27710981 is an apocalyptic number.

It is an amenable number.

27710981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27710981 is an equidigital number, since it uses as much as digits as its factorization.

27710981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 27710981 is about 5264.1220540561. The cubic root of 27710981 is about 302.6104816939.

The spelling of 27710981 in words is "twenty-seven million, seven hundred ten thousand, nine hundred eighty-one".