27545261 has 2 divisors, whose sum is σ = 27545262. Its totient is φ = 27545260.

The previous prime is 27545257. The next prime is 27545263. The reversal of 27545261 is 16254572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19193161 + 8352100 = 4381^2 + 2890^2 .

It is a cyclic number.

It is not a de Polignac number, because 27545261 - 2² = 27545257 is a prime.

Together with 27545263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27545263) 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, 13772630 + 13772631.

It is an arithmetic number, because the mean of its divisors is an integer number (13772631).

Almost surely, 2^27545261 is an apocalyptic number.

It is an amenable number.

27545261 is a deficient number, since it is larger than the sum of its proper divisors (1).

27545261 is an equidigital number, since it uses as much as digits as its factorization.

27545261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 32.

The square root of 27545261 is about 5248.3579336779. The cubic root of 27545261 is about 302.0060412808.

The spelling of 27545261 in words is "twenty-seven million, five hundred forty-five thousand, two hundred sixty-one".