27148981 has 2 divisors, whose sum is σ = 27148982. Its totient is φ = 27148980.

The previous prime is 27148969. The next prime is 27148997. The reversal of 27148981 is 18984172.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26946481 + 202500 = 5191^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 27148981 - 2¹⁵ = 27116213 is a prime.

It is a super-2 number, since 2×27148981² = 1474134338676722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27148081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13574490 + 13574491.

It is an arithmetic number, because the mean of its divisors is an integer number (13574491).

Almost surely, 2^27148981 is an apocalyptic number.

It is an amenable number.

27148981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27148981 is an equidigital number, since it uses as much as digits as its factorization.

27148981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 27148981 is about 5210.4684050477. The cubic root of 27148981 is about 300.5507697051.

The spelling of 27148981 in words is "twenty-seven million, one hundred forty-eight thousand, nine hundred eighty-one".