515211212 has 24 divisors (see below), whose sum is σ = 914711616. Its totient is φ = 253880528.

The previous prime is 515211209. The next prime is 515211223. The reversal of 515211212 is 212112515.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153383 + ... + 156705.

It is an arithmetic number, because the mean of its divisors is an integer number (38112984).

Almost surely, 2^515211212 is an apocalyptic number.

It is an amenable number.

515211212 is a deficient number, since it is larger than the sum of its proper divisors (399500404).

515211212 is a wasteful number, since it uses less digits than its factorization.

515211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877 (or 3875 counting only the distinct ones).

The product of its digits is 200, while the sum is 20.

The square root of 515211212 is about 22698.2645151562. The cubic root of 515211212 is about 801.6690217863.

Adding to 515211212 its reverse (212112515), we get a palindrome (727323727).

The spelling of 515211212 in words is "five hundred fifteen million, two hundred eleven thousand, two hundred twelve".