11561312027 has 2 divisors, whose sum is σ = 11561312028. Its totient is φ = 11561312026.

The previous prime is 11561311991. The next prime is 11561312029. The reversal of 11561312027 is 72021316511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11561312027 - 2⁶ = 11561311963 is a prime.

Together with 11561312029, 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 (11561312029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5780656013 + 5780656014.

It is an arithmetic number, because the mean of its divisors is an integer number (5780656014).

Almost surely, 2^11561312027 is an apocalyptic number.

11561312027 is a deficient number, since it is larger than the sum of its proper divisors (1).

11561312027 is an equidigital number, since it uses as much as digits as its factorization.

11561312027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

Adding to 11561312027 its reverse (72021316511), we get a palindrome (83582628538).

The spelling of 11561312027 in words is "eleven billion, five hundred sixty-one million, three hundred twelve thousand, twenty-seven".