512247821 has 2 divisors, whose sum is σ = 512247822. Its totient is φ = 512247820.

The previous prime is 512247817. The next prime is 512247833. The reversal of 512247821 is 128742215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489073225 + 23174596 = 22115^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 512247821 - 2² = 512247817 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 (512247221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256123910 + 256123911.

It is an arithmetic number, because the mean of its divisors is an integer number (256123911).

Almost surely, 2^512247821 is an apocalyptic number.

It is an amenable number.

512247821 is a deficient number, since it is larger than the sum of its proper divisors (1).

512247821 is an equidigital number, since it uses as much as digits as its factorization.

512247821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 512247821 is about 22632.8924576599. The cubic root of 512247821 is about 800.1290526182.

The spelling of 512247821 in words is "five hundred twelve million, two hundred forty-seven thousand, eight hundred twenty-one".