27613721 has 2 divisors, whose sum is σ = 27613722. Its totient is φ = 27613720.

The previous prime is 27613717. The next prime is 27613753. The reversal of 27613721 is 12731672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27415696 + 198025 = 5236^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 27613721 - 2² = 27613717 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27213721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13806860 + 13806861.

It is an arithmetic number, because the mean of its divisors is an integer number (13806861).

Almost surely, 2^27613721 is an apocalyptic number.

It is an amenable number.

27613721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27613721 is an equidigital number, since it uses as much as digits as its factorization.

27613721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 29.

The square root of 27613721 is about 5254.8759262232. The cubic root of 27613721 is about 302.2560326026.

The spelling of 27613721 in words is "twenty-seven million, six hundred thirteen thousand, seven hundred twenty-one".