51381212 has 12 divisors (see below), whose sum is σ = 91441560. Its totient is φ = 25255056.

The previous prime is 51381179. The next prime is 51381217. The reversal of 51381212 is 21218315.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51381217) 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, 108623 + ... + 109094.

It is an arithmetic number, because the mean of its divisors is an integer number (7620130).

Almost surely, 2^51381212 is an apocalyptic number.

It is an amenable number.

51381212 is a deficient number, since it is larger than the sum of its proper divisors (40060348).

51381212 is a wasteful number, since it uses less digits than its factorization.

51381212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217780 (or 217778 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 51381212 is about 7168.0689170794. The cubic root of 51381212 is about 371.7646698285.

Adding to 51381212 its reverse (21218315), we get a palindrome (72599527).

The spelling of 51381212 in words is "fifty-one million, three hundred eighty-one thousand, two hundred twelve".