220838561 has 2 divisors, whose sum is σ = 220838562. Its totient is φ = 220838560.

The previous prime is 220838549. The next prime is 220838591. The reversal of 220838561 is 165838022.

220838561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150798400 + 70040161 = 12280^2 + 8369^2 .

It is a cyclic number.

It is not a de Polignac number, because 220838561 - 2¹⁴ = 220822177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220838521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110419280 + 110419281.

It is an arithmetic number, because the mean of its divisors is an integer number (110419281).

Almost surely, 2^220838561 is an apocalyptic number.

It is an amenable number.

220838561 is a deficient number, since it is larger than the sum of its proper divisors (1).

220838561 is an equidigital number, since it uses as much as digits as its factorization.

220838561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 220838561 is about 14860.6379741921. The cubic root of 220838561 is about 604.4471063809.

The spelling of 220838561 in words is "two hundred twenty million, eight hundred thirty-eight thousand, five hundred sixty-one".