27661913 has 2 divisors, whose sum is σ = 27661914. Its totient is φ = 27661912.

The previous prime is 27661901. The next prime is 27661979. The reversal of 27661913 is 31916672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27541504 + 120409 = 5248^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 27661913 - 2⁶ = 27661849 is a prime.

It is not a weakly prime, because it can be changed into another prime (27661013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13830956 + 13830957.

It is an arithmetic number, because the mean of its divisors is an integer number (13830957).

Almost surely, 2^27661913 is an apocalyptic number.

It is an amenable number.

27661913 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661913 is an equidigital number, since it uses as much as digits as its factorization.

27661913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 27661913 is about 5259.4593828644. The cubic root of 27661913 is about 302.4317647700.

The spelling of 27661913 in words is "twenty-seven million, six hundred sixty-one thousand, nine hundred thirteen".