51512212 has 6 divisors (see below), whose sum is σ = 90146378. Its totient is φ = 25756104.

The previous prime is 51512189. The next prime is 51512233. The reversal of 51512212 is 21221515.

It can be written as a sum of positive squares in only one way, i.e., 39992976 + 11519236 = 6324^2 + 3394^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51512212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6439023 + ... + 6439030.

Almost surely, 2^51512212 is an apocalyptic number.

It is an amenable number.

51512212 is a deficient number, since it is larger than the sum of its proper divisors (38634166).

51512212 is a wasteful number, since it uses less digits than its factorization.

51512212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12878057 (or 12878055 counting only the distinct ones).

The product of its digits is 200, while the sum is 19.

The square root of 51512212 is about 7177.2008471270. The cubic root of 51512212 is about 372.0803483898.

Adding to 51512212 its reverse (21221515), we get a palindrome (72733727).

The spelling of 51512212 in words is "fifty-one million, five hundred twelve thousand, two hundred twelve".