51231212 has 12 divisors (see below), whose sum is σ = 93552816. Its totient is φ = 24501840.

The previous prime is 51231211. The next prime is 51231223. The reversal of 51231212 is 21213215.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51231211) 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, 278339 + ... + 278522.

It is an arithmetic number, because the mean of its divisors is an integer number (7796068).

Almost surely, 2^51231212 is an apocalyptic number.

It is an amenable number.

51231212 is a deficient number, since it is larger than the sum of its proper divisors (42321604).

51231212 is a wasteful number, since it uses less digits than its factorization.

51231212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556888 (or 556886 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 51231212 is about 7157.5982005139. The cubic root of 51231212 is about 371.4025461900.

Adding to 51231212 its reverse (21213215), we get a palindrome (72444427).

The spelling of 51231212 in words is "fifty-one million, two hundred thirty-one thousand, two hundred twelve".