11222561 has 8 divisors (see below), whose sum is σ = 13138944. Its totient is φ = 9384480.

The previous prime is 11222539. The next prime is 11222573. The reversal of 11222561 is 16522211.

11222561 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11222561 - 2¹⁴ = 11206177 is a prime.

11222561 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (11222501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19265 + ... + 19838.

It is an arithmetic number, because the mean of its divisors is an integer number (1642368).

Almost surely, 2^11222561 is an apocalyptic number.

It is an amenable number.

11222561 is a deficient number, since it is larger than the sum of its proper divisors (1916383).

11222561 is an equidigital number, since it uses as much as digits as its factorization.

11222561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39151.

The product of its digits is 240, while the sum is 20.

The square root of 11222561 is about 3350.0091044652. The cubic root of 11222561 is about 223.8879182579.

Adding to 11222561 its reverse (16522211), we get a palindrome (27744772).

The spelling of 11222561 in words is "eleven million, two hundred twenty-two thousand, five hundred sixty-one".