512219905 has 4 divisors (see below), whose sum is σ = 614663892. Its totient is φ = 409775920.

The previous prime is 512219899. The next prime is 512219909. The reversal of 512219905 is 509912215.

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 303735184 + 208484721 = 17428^2 + 14439^2 .

It is a de Polignac number, because none of the positive numbers 2^k-512219905 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (512219909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51221986 + ... + 51221995.

It is an arithmetic number, because the mean of its divisors is an integer number (153665973).

Almost surely, 2^512219905 is an apocalyptic number.

It is an amenable number.

512219905 is a deficient number, since it is larger than the sum of its proper divisors (102443987).

512219905 is a wasteful number, since it uses less digits than its factorization.

512219905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102443986.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 512219905 is about 22632.2757362135. The cubic root of 512219905 is about 800.1145174606.

The spelling of 512219905 in words is "five hundred twelve million, two hundred nineteen thousand, nine hundred five".