220226561 has 8 divisors (see below), whose sum is σ = 222842664. Its totient is φ = 217619200.

The previous prime is 220226519. The next prime is 220226563. The reversal of 220226561 is 165622022.

It can be written as a sum of positive squares in 4 ways, for example, as 135862336 + 84364225 = 11656^2 + 9185^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220226561 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 220226561.

It is not an unprimeable number, because it can be changed into a prime (220226563) 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, 58055 + ... + 61731.

It is an arithmetic number, because the mean of its divisors is an integer number (27855333).

Almost surely, 2^220226561 is an apocalyptic number.

It is an amenable number.

220226561 is a deficient number, since it is larger than the sum of its proper divisors (2616103).

220226561 is a wasteful number, since it uses less digits than its factorization.

220226561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4371.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 220226561 is about 14840.0323786709. The cubic root of 220226561 is about 603.8882307476. Note that the first 3 decimals are identical.

Adding to 220226561 its reverse (165622022), we get a palindrome (385848583).

The spelling of 220226561 in words is "two hundred twenty million, two hundred twenty-six thousand, five hundred sixty-one".