27561013 has 2 divisors, whose sum is σ = 27561014. Its totient is φ = 27561012.

The previous prime is 27561011. The next prime is 27561019. The reversal of 27561013 is 31016572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22972849 + 4588164 = 4793^2 + 2142^2 .

It is a cyclic number.

It is not a de Polignac number, because 27561013 - 2¹ = 27561011 is a prime.

Together with 27561011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27561011) 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 as a sum of consecutive naturals, namely, 13780506 + 13780507.

It is an arithmetic number, because the mean of its divisors is an integer number (13780507).

Almost surely, 2^27561013 is an apocalyptic number.

It is an amenable number.

27561013 is a deficient number, since it is larger than the sum of its proper divisors (1).

27561013 is an equidigital number, since it uses as much as digits as its factorization.

27561013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 27561013 is about 5249.8583790422. The cubic root of 27561013 is about 302.0635985818.

Adding to 27561013 its reverse (31016572), we get a palindrome (58577585).

The spelling of 27561013 in words is "twenty-seven million, five hundred sixty-one thousand, thirteen".