27561011 has 2 divisors, whose sum is σ = 27561012. Its totient is φ = 27561010.

The previous prime is 27560999. The next prime is 27561013. The reversal of 27561011 is 11016572.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27561011 - 2⁶ = 27560947 is a prime.

Together with 27561013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27561013) 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, 13780505 + 13780506.

It is an arithmetic number, because the mean of its divisors is an integer number (13780506).

Almost surely, 2^27561011 is an apocalyptic number.

27561011 is a deficient number, since it is larger than the sum of its proper divisors (1).

27561011 is an equidigital number, since it uses as much as digits as its factorization.

27561011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 27561011 is about 5249.8581885609. The cubic root of 27561011 is about 302.0635912753.

Adding to 27561011 its reverse (11016572), we get a palindrome (38577583).

The spelling of 27561011 in words is "twenty-seven million, five hundred sixty-one thousand, eleven".