511820213 has 2 divisors, whose sum is σ = 511820214. Its totient is φ = 511820212.

The previous prime is 511820201. The next prime is 511820299. The reversal of 511820213 is 312028115.

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., 432556804 + 79263409 = 20798^2 + 8903^2 .

It is a cyclic number.

It is not a de Polignac number, because 511820213 - 2¹² = 511816117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511825213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255910106 + 255910107.

It is an arithmetic number, because the mean of its divisors is an integer number (255910107).

Almost surely, 2^511820213 is an apocalyptic number.

It is an amenable number.

511820213 is a deficient number, since it is larger than the sum of its proper divisors (1).

511820213 is an equidigital number, since it uses as much as digits as its factorization.

511820213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 511820213 is about 22623.4438801876. The cubic root of 511820213 is about 799.9063499750.

Adding to 511820213 its reverse (312028115), we get a palindrome (823848328).

The spelling of 511820213 in words is "five hundred eleven million, eight hundred twenty thousand, two hundred thirteen".