220285561 has 2 divisors, whose sum is σ = 220285562. Its totient is φ = 220285560.

The previous prime is 220285553. The next prime is 220285577. The reversal of 220285561 is 165582022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161671225 + 58614336 = 12715^2 + 7656^2 .

It is a cyclic number.

It is not a de Polignac number, because 220285561 - 2³ = 220285553 is a prime.

It is not a weakly prime, because it can be changed into another prime (220285361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110142780 + 110142781.

It is an arithmetic number, because the mean of its divisors is an integer number (110142781).

Almost surely, 2^220285561 is an apocalyptic number.

It is an amenable number.

220285561 is a deficient number, since it is larger than the sum of its proper divisors (1).

220285561 is an equidigital number, since it uses as much as digits as its factorization.

220285561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 220285561 is about 14842.0201118311. The cubic root of 220285561 is about 603.9421543436.

The spelling of 220285561 in words is "two hundred twenty million, two hundred eighty-five thousand, five hundred sixty-one".