11255561 has 2 divisors, whose sum is σ = 11255562. Its totient is φ = 11255560.

The previous prime is 11255549. The next prime is 11255603. The reversal of 11255561 is 16555211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11095561 + 160000 = 3331^2 + 400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11255561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11255561.

It is not a weakly prime, because it can be changed into another prime (11255261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5627780 + 5627781.

It is an arithmetic number, because the mean of its divisors is an integer number (5627781).

Almost surely, 2^11255561 is an apocalyptic number.

It is an amenable number.

11255561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11255561 is an equidigital number, since it uses as much as digits as its factorization.

11255561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500, while the sum is 26.

The square root of 11255561 is about 3354.9308487657. The cubic root of 11255561 is about 224.1071513822.

The spelling of 11255561 in words is "eleven million, two hundred fifty-five thousand, five hundred sixty-one".