512244221 has 4 divisors (see below), whose sum is σ = 542376252. Its totient is φ = 482112192.

The previous prime is 512244193. The next prime is 512244223. The reversal of 512244221 is 122442215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 305200900 + 207043321 = 17470^2 + 14389^2 .

It is a cyclic number.

It is not a de Polignac number, because 512244221 - 2¹⁸ = 511982077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512244223) 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 in 3 ways as a sum of consecutive naturals, for example, 15065990 + ... + 15066023.

It is an arithmetic number, because the mean of its divisors is an integer number (135594063).

Almost surely, 2^512244221 is an apocalyptic number.

It is an amenable number.

512244221 is a deficient number, since it is larger than the sum of its proper divisors (30132031).

512244221 is a wasteful number, since it uses less digits than its factorization.

512244221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30132030.

The product of its digits is 1280, while the sum is 23.

The square root of 512244221 is about 22632.8129272523. The cubic root of 512244221 is about 800.1271782186.

Adding to 512244221 its reverse (122442215), we get a palindrome (634686436).

The spelling of 512244221 in words is "five hundred twelve million, two hundred forty-four thousand, two hundred twenty-one".