11866549 has 2 divisors, whose sum is σ = 11866550. Its totient is φ = 11866548.

The previous prime is 11866487. The next prime is 11866553. The reversal of 11866549 is 94566811.

11866549 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., 9878449 + 1988100 = 3143^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 11866549 - 2¹⁵ = 11833781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11866579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5933274 + 5933275.

It is an arithmetic number, because the mean of its divisors is an integer number (5933275).

Almost surely, 2^11866549 is an apocalyptic number.

It is an amenable number.

11866549 is a deficient number, since it is larger than the sum of its proper divisors (1).

11866549 is an equidigital number, since it uses as much as digits as its factorization.

11866549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 11866549 is about 3444.7857698266. The cubic root of 11866549 is about 228.0909980974.

The spelling of 11866549 in words is "eleven million, eight hundred sixty-six thousand, five hundred forty-nine".