27711721 has 2 divisors, whose sum is σ = 27711722. Its totient is φ = 27711720.

The previous prime is 27711713. The next prime is 27711727. The reversal of 27711721 is 12711772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27709696 + 2025 = 5264^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 27711721 - 2³ = 27711713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27711721.

It is not a weakly prime, because it can be changed into another prime (27711727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13855860 + 13855861.

It is an arithmetic number, because the mean of its divisors is an integer number (13855861).

Almost surely, 2^27711721 is an apocalyptic number.

It is an amenable number.

27711721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27711721 is an equidigital number, since it uses as much as digits as its factorization.

27711721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1372, while the sum is 28.

The square root of 27711721 is about 5264.1923407110. The cubic root of 27711721 is about 302.6131753284.

The spelling of 27711721 in words is "twenty-seven million, seven hundred eleven thousand, seven hundred twenty-one".