573551221 has 2 divisors, whose sum is σ = 573551222. Its totient is φ = 573551220.

The previous prime is 573551191. The next prime is 573551239. The reversal of 573551221 is 122155375.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570540996 + 3010225 = 23886^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 573551221 - 2²¹ = 571454069 is a prime.

It is a super-2 number, since 2×573551221² = 657922006221181682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (573551261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 286775610 + 286775611.

It is an arithmetic number, because the mean of its divisors is an integer number (286775611).

Almost surely, 2^573551221 is an apocalyptic number.

It is an amenable number.

573551221 is a deficient number, since it is larger than the sum of its proper divisors (1).

573551221 is an equidigital number, since it uses as much as digits as its factorization.

573551221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10500, while the sum is 31.

The square root of 573551221 is about 23948.9294332753. The cubic root of 573551221 is about 830.8527650995.

The spelling of 573551221 in words is "five hundred seventy-three million, five hundred fifty-one thousand, two hundred twenty-one".