511052221 has 2 divisors, whose sum is σ = 511052222. Its totient is φ = 511052220.

The previous prime is 511052219. The next prime is 511052237. The reversal of 511052221 is 122250115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 405579321 + 105472900 = 20139^2 + 10270^2 .

It is a cyclic number.

It is not a de Polignac number, because 511052221 - 2¹ = 511052219 is a prime.

It is a super-2 number, since 2×511052221² = 522348745178065682, which contains 22 as substring.

Together with 511052219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511052281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255526110 + 255526111.

It is an arithmetic number, because the mean of its divisors is an integer number (255526111).

Almost surely, 2^511052221 is an apocalyptic number.

It is an amenable number.

511052221 is a deficient number, since it is larger than the sum of its proper divisors (1).

511052221 is an equidigital number, since it uses as much as digits as its factorization.

511052221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 511052221 is about 22606.4641419219. The cubic root of 511052221 is about 799.5060601963.

The spelling of 511052221 in words is "five hundred eleven million, fifty-two thousand, two hundred twenty-one".