22116559 has 4 divisors (see below), whose sum is σ = 22160520. Its totient is φ = 22072600.

The previous prime is 22116539. The next prime is 22116569. The reversal of 22116559 is 95561122.

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

It is a cyclic number.

It is not a de Polignac number, because 22116559 - 2⁵ = 22116527 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 22116559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22116539) 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, 21217 + ... + 22234.

It is an arithmetic number, because the mean of its divisors is an integer number (5540130).

Almost surely, 2^22116559 is an apocalyptic number.

22116559 is a deficient number, since it is larger than the sum of its proper divisors (43961).

22116559 is an equidigital number, since it uses as much as digits as its factorization.

22116559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43960.

The product of its digits is 5400, while the sum is 31.

The square root of 22116559 is about 4702.8245767836. The cubic root of 22116559 is about 280.6979145785.

It can be divided in two parts, 2211655 and 9, that multiplied together give a triangular number (19904895 = T₆₃₀₉).

The spelling of 22116559 in words is "twenty-two million, one hundred sixteen thousand, five hundred fifty-nine".