27721061 has 2 divisors, whose sum is σ = 27721062. Its totient is φ = 27721060.

The previous prime is 27721039. The next prime is 27721063. The reversal of 27721061 is 16012772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 11600836 = 4015^2 + 3406^2 .

It is a cyclic number.

It is not a de Polignac number, because 27721061 - 2⁶ = 27720997 is a prime.

Together with 27721063, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 27721061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27721063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860530 + 13860531.

It is an arithmetic number, because the mean of its divisors is an integer number (13860531).

Almost surely, 2^27721061 is an apocalyptic number.

It is an amenable number.

27721061 is a deficient number, since it is larger than the sum of its proper divisors (1).

27721061 is an equidigital number, since it uses as much as digits as its factorization.

27721061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 27721061 is about 5265.0793916141. The cubic root of 27721061 is about 302.6471692424.

The spelling of 27721061 in words is "twenty-seven million, seven hundred twenty-one thousand, sixty-one".