11818549 has 2 divisors, whose sum is σ = 11818550. Its totient is φ = 11818548.

The previous prime is 11818511. The next prime is 11818559. The reversal of 11818549 is 94581811.

11818549 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., 7387524 + 4431025 = 2718^2 + 2105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11818549 is a prime.

It is equal to p₇₇₆₉₁₇ and since 11818549 and 776917 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11818559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5909274 + 5909275.

It is an arithmetic number, because the mean of its divisors is an integer number (5909275).

Almost surely, 2^11818549 is an apocalyptic number.

It is an amenable number.

11818549 is a deficient number, since it is larger than the sum of its proper divisors (1).

11818549 is an equidigital number, since it uses as much as digits as its factorization.

11818549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 37.

The square root of 11818549 is about 3437.8116585991. The cubic root of 11818549 is about 227.7830410223.

It can be divided in two parts, 1181 and 8549, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 11818549 in words is "eleven million, eight hundred eighteen thousand, five hundred forty-nine".