11271808861 has 2 divisors, whose sum is σ = 11271808862. Its totient is φ = 11271808860.

The previous prime is 11271808859. The next prime is 11271808903. The reversal of 11271808861 is 16880817211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7961992900 + 3309815961 = 89230^2 + 57531^2 .

It is a cyclic number.

It is not a de Polignac number, because 11271808861 - 2¹ = 11271808859 is a prime.

Together with 11271808859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11271838861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5635904430 + 5635904431.

It is an arithmetic number, because the mean of its divisors is an integer number (5635904431).

Almost surely, 2^11271808861 is an apocalyptic number.

It is an amenable number.

11271808861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11271808861 is an equidigital number, since it uses as much as digits as its factorization.

11271808861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 43.

The spelling of 11271808861 in words is "eleven billion, two hundred seventy-one million, eight hundred eight thousand, eight hundred sixty-one".