512665221 has 16 divisors (see below), whose sum is σ = 704506880. Its totient is φ = 331415280.

The previous prime is 512665217. The next prime is 512665247. The reversal of 512665221 is 122566215.

It is not a de Polignac number, because 512665221 - 2² = 512665217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512665211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3636 + ... + 32226.

It is an arithmetic number, because the mean of its divisors is an integer number (44031680).

Almost surely, 2^512665221 is an apocalyptic number.

It is an amenable number.

512665221 is a deficient number, since it is larger than the sum of its proper divisors (191841659).

512665221 is a wasteful number, since it uses less digits than its factorization.

512665221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28776.

The product of its digits is 7200, while the sum is 30.

The square root of 512665221 is about 22642.1116727217. Note that the first 3 decimals coincide. The cubic root of 512665221 is about 800.3463193279.

The spelling of 512665221 in words is "five hundred twelve million, six hundred sixty-five thousand, two hundred twenty-one".