513102221 has 2 divisors, whose sum is σ = 513102222. Its totient is φ = 513102220.

The previous prime is 513102203. The next prime is 513102251. The reversal of 513102221 is 122201315.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370562500 + 142539721 = 19250^2 + 11939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513102221 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 513102221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513102251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256551110 + 256551111.

It is an arithmetic number, because the mean of its divisors is an integer number (256551111).

Almost surely, 2^513102221 is an apocalyptic number.

It is an amenable number.

513102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

513102221 is an equidigital number, since it uses as much as digits as its factorization.

513102221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 513102221 is about 22651.7597771122. The cubic root of 513102221 is about 800.5736619791.

Adding to 513102221 its reverse (122201315), we get a palindrome (635303536).

The spelling of 513102221 in words is "five hundred thirteen million, one hundred two thousand, two hundred twenty-one".