202220561 has 2 divisors, whose sum is σ = 202220562. Its totient is φ = 202220560.

The previous prime is 202220537. The next prime is 202220573. The reversal of 202220561 is 165022202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131239936 + 70980625 = 11456^2 + 8425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202220561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (202220581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110280 + 101110281.

It is an arithmetic number, because the mean of its divisors is an integer number (101110281).

Almost surely, 2^202220561 is an apocalyptic number.

It is an amenable number.

202220561 is a deficient number, since it is larger than the sum of its proper divisors (1).

202220561 is an equidigital number, since it uses as much as digits as its factorization.

202220561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 202220561 is about 14220.4275955402. The cubic root of 202220561 is about 586.9599065976.

Adding to 202220561 its reverse (165022202), we get a palindrome (367242763).

The spelling of 202220561 in words is "two hundred two million, two hundred twenty thousand, five hundred sixty-one".