27149981 has 2 divisors, whose sum is σ = 27149982. Its totient is φ = 27149980.

The previous prime is 27149977. The next prime is 27150001. The reversal of 27149981 is 18994172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24344356 + 2805625 = 4934^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 27149981 - 2² = 27149977 is a prime.

It is a super-2 number, since 2×27149981² = 1474242936600722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27149921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13574990 + 13574991.

It is an arithmetic number, because the mean of its divisors is an integer number (13574991).

Almost surely, 2^27149981 is an apocalyptic number.

It is an amenable number.

27149981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27149981 is an equidigital number, since it uses as much as digits as its factorization.

27149981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 27149981 is about 5210.5643648265. The cubic root of 27149981 is about 300.5544598016.

The spelling of 27149981 in words is "twenty-seven million, one hundred forty-nine thousand, nine hundred eighty-one".