552306221 has 2 divisors, whose sum is σ = 552306222. Its totient is φ = 552306220.

The previous prime is 552306179. The next prime is 552306277. The reversal of 552306221 is 122603255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 551592196 + 714025 = 23486^2 + 845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-552306221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (552306281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276153110 + 276153111.

It is an arithmetic number, because the mean of its divisors is an integer number (276153111).

Almost surely, 2^552306221 is an apocalyptic number.

It is an amenable number.

552306221 is a deficient number, since it is larger than the sum of its proper divisors (1).

552306221 is an equidigital number, since it uses as much as digits as its factorization.

552306221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 552306221 is about 23501.1961610468. The cubic root of 552306221 is about 820.4648469840.

Adding to 552306221 its reverse (122603255), we get a palindrome (674909476).

The spelling of 552306221 in words is "five hundred fifty-two million, three hundred six thousand, two hundred twenty-one".