11984561 has 2 divisors, whose sum is σ = 11984562. Its totient is φ = 11984560.

The previous prime is 11984551. The next prime is 11984597. The reversal of 11984561 is 16548911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7595536 + 4389025 = 2756^2 + 2095^2 .

It is an emirp because it is prime and its reverse (16548911) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11984561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11984521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5992280 + 5992281.

It is an arithmetic number, because the mean of its divisors is an integer number (5992281).

Almost surely, 2^11984561 is an apocalyptic number.

It is an amenable number.

11984561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11984561 is an equidigital number, since it uses as much as digits as its factorization.

11984561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 35.

The square root of 11984561 is about 3461.8724702103. The cubic root of 11984561 is about 228.8446216886.

The spelling of 11984561 in words is "eleven million, nine hundred eighty-four thousand, five hundred sixty-one".