27565081 has 2 divisors, whose sum is σ = 27565082. Its totient is φ = 27565080.

The previous prime is 27565061. The next prime is 27565091. The reversal of 27565081 is 18056572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26163225 + 1401856 = 5115^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 27565081 - 2¹⁵ = 27532313 is a prime.

It is a super-2 number, since 2×27565081² = 1519667381073122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27565001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13782540 + 13782541.

It is an arithmetic number, because the mean of its divisors is an integer number (13782541).

Almost surely, 2^27565081 is an apocalyptic number.

It is an amenable number.

27565081 is a deficient number, since it is larger than the sum of its proper divisors (1).

27565081 is an equidigital number, since it uses as much as digits as its factorization.

27565081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 27565081 is about 5250.2458037696. The cubic root of 27565081 is about 302.0784593596.

It can be divided in two parts, 275 and 65081, that added together give a palindrome (65356).

The spelling of 27565081 in words is "twenty-seven million, five hundred sixty-five thousand, eighty-one".