27091261 has 2 divisors, whose sum is σ = 27091262. Its totient is φ = 27091260.

The previous prime is 27091237. The next prime is 27091271. The reversal of 27091261 is 16219072.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22382361 + 4708900 = 4731^2 + 2170^2 .

It is a cyclic number.

It is not a de Polignac number, because 27091261 - 2¹⁷ = 26960189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27091231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13545630 + 13545631.

It is an arithmetic number, because the mean of its divisors is an integer number (13545631).

Almost surely, 2^27091261 is an apocalyptic number.

It is an amenable number.

27091261 is a deficient number, since it is larger than the sum of its proper divisors (1).

27091261 is an equidigital number, since it uses as much as digits as its factorization.

27091261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 27091261 is about 5204.9266085124. The cubic root of 27091261 is about 300.3376235955.

The spelling of 27091261 in words is "twenty-seven million, ninety-one thousand, two hundred sixty-one".