27297981 has 12 divisors (see below), whose sum is σ = 39522652. Its totient is φ = 18156096.

The previous prime is 27297973. The next prime is 27297989. The reversal of 27297981 is 18979272.

It is an interprime number because it is at equal distance from previous prime (27297973) and next prime (27297989).

It can be written as a sum of positive squares in 2 ways, for example, as 10208025 + 17089956 = 3195^2 + 4134^2 .

It is not a de Polignac number, because 27297981 - 2³ = 27297973 is a prime.

It is a super-2 number, since 2×27297981² = 1490359533352722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27297989) 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 in 11 ways as a sum of consecutive naturals, for example, 795 + ... + 7431.

Almost surely, 2^27297981 is an apocalyptic number.

It is an amenable number.

27297981 is a deficient number, since it is larger than the sum of its proper divisors (12224671).

27297981 is a wasteful number, since it uses less digits than its factorization.

27297981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7100 (or 7097 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 27297981 is about 5224.7469795197. The cubic root of 27297981 is about 301.0995980231.

The spelling of 27297981 in words is "twenty-seven million, two hundred ninety-seven thousand, nine hundred eighty-one".