11555549 has 2 divisors, whose sum is σ = 11555550. Its totient is φ = 11555548.

The previous prime is 11555501. The next prime is 11555587. The reversal of 11555549 is 94555511.

11555549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11323225 + 232324 = 3365^2 + 482^2 .

It is an emirp because it is prime and its reverse (94555511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11555549 - 2¹² = 11551453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11555149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5777774 + 5777775.

It is an arithmetic number, because the mean of its divisors is an integer number (5777775).

Almost surely, 2^11555549 is an apocalyptic number.

It is an amenable number.

11555549 is a deficient number, since it is larger than the sum of its proper divisors (1).

11555549 is an equidigital number, since it uses as much as digits as its factorization.

11555549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22500, while the sum is 35.

The square root of 11555549 is about 3399.3453781574. The cubic root of 11555549 is about 226.0807201152.

The spelling of 11555549 in words is "eleven million, five hundred fifty-five thousand, five hundred forty-nine".