11822561 has 4 divisors (see below), whose sum is σ = 11882772. Its totient is φ = 11762352.

The previous prime is 11822533. The next prime is 11822567. The reversal of 11822561 is 16522811.

11822561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10601536 + 1221025 = 3256^2 + 1105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11822561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11822561.

It is not an unprimeable number, because it can be changed into a prime (11822567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29810 + ... + 30203.

It is an arithmetic number, because the mean of its divisors is an integer number (2970693).

Almost surely, 2^11822561 is an apocalyptic number.

It is an amenable number.

11822561 is a deficient number, since it is larger than the sum of its proper divisors (60211).

11822561 is an equidigital number, since it uses as much as digits as its factorization.

11822561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60210.

The product of its digits is 960, while the sum is 26.

The square root of 11822561 is about 3438.3951198197. The cubic root of 11822561 is about 227.8088130008.

The spelling of 11822561 in words is "eleven million, eight hundred twenty-two thousand, five hundred sixty-one".