27949561 has 2 divisors, whose sum is σ = 27949562. Its totient is φ = 27949560.

The previous prime is 27949553. The next prime is 27949601. The reversal of 27949561 is 16594972.

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., 27667600 + 281961 = 5260^2 + 531^2 .

It is a cyclic number.

It is not a de Polignac number, because 27949561 - 2³ = 27949553 is a prime.

It is not a weakly prime, because it can be changed into another prime (27949501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13974780 + 13974781.

It is an arithmetic number, because the mean of its divisors is an integer number (13974781).

Almost surely, 2^27949561 is an apocalyptic number.

It is an amenable number.

27949561 is a deficient number, since it is larger than the sum of its proper divisors (1).

27949561 is an equidigital number, since it uses as much as digits as its factorization.

27949561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 27949561 is about 5286.7344363038. The cubic root of 27949561 is about 303.4764512686.

The spelling of 27949561 in words is "twenty-seven million, nine hundred forty-nine thousand, five hundred sixty-one".