51331212 has 24 divisors (see below), whose sum is σ = 133081200. Its totient is φ = 17110368.

The previous prime is 51331199. The next prime is 51331213. The reversal of 51331212 is 21213315.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51331213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237537 + ... + 237752.

It is an arithmetic number, because the mean of its divisors is an integer number (5545050).

Almost surely, 2^51331212 is an apocalyptic number.

It is an amenable number.

51331212 is an abundant number, since it is smaller than the sum of its proper divisors (81749988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51331212 is a wasteful number, since it uses less digits than its factorization.

51331212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475302 (or 475294 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 51331212 is about 7164.5803785009. The cubic root of 51331212 is about 371.6440403510.

Adding to 51331212 its reverse (21213315), we get a palindrome (72544527).

The spelling of 51331212 in words is "fifty-one million, three hundred thirty-one thousand, two hundred twelve".