27661013 has 2 divisors, whose sum is σ = 27661014. Its totient is φ = 27661012.

The previous prime is 27661003. The next prime is 27661031. The reversal of 27661013 is 31016672.

Together with next prime (27661031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27636049 + 24964 = 5257^2 + 158^2 .

It is a cyclic number.

It is not a de Polignac number, because 27661013 - 2⁶ = 27660949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27661003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13830506 + 13830507.

It is an arithmetic number, because the mean of its divisors is an integer number (13830507).

Almost surely, 2^27661013 is an apocalyptic number.

It is an amenable number.

27661013 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661013 is an equidigital number, since it uses as much as digits as its factorization.

27661013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 27661013 is about 5259.3738220438. The cubic root of 27661013 is about 302.4284847903.

Adding to 27661013 its reverse (31016672), we get a palindrome (58677685).

The spelling of 27661013 in words is "twenty-seven million, six hundred sixty-one thousand, thirteen".