220142561 has 2 divisors, whose sum is σ = 220142562. Its totient is φ = 220142560.

The previous prime is 220142551. The next prime is 220142579. The reversal of 220142561 is 165241022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161772961 + 58369600 = 12719^2 + 7640^2 .

It is a cyclic number.

It is not a de Polignac number, because 220142561 - 2¹⁴ = 220126177 is a prime.

It is not a weakly prime, because it can be changed into another prime (220142521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110071280 + 110071281.

It is an arithmetic number, because the mean of its divisors is an integer number (110071281).

Almost surely, 2^220142561 is an apocalyptic number.

It is an amenable number.

220142561 is a deficient number, since it is larger than the sum of its proper divisors (1).

220142561 is an equidigital number, since it uses as much as digits as its factorization.

220142561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 220142561 is about 14837.2019262393. The cubic root of 220142561 is about 603.8114415507.

Adding to 220142561 its reverse (165241022), we get a palindrome (385383583).

The spelling of 220142561 in words is "two hundred twenty million, one hundred forty-two thousand, five hundred sixty-one".