51204312 has 80 divisors (see below), whose sum is σ = 148104000. Its totient is φ = 16511040.

The previous prime is 51204311. The next prime is 51204319. The reversal of 51204312 is 21340215.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51204311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18814 + ... + 21362.

It is an arithmetic number, because the mean of its divisors is an integer number (1851300).

Almost surely, 2^51204312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51204312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74052000).

51204312 is an abundant number, since it is smaller than the sum of its proper divisors (96899688).

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

51204312 is a wasteful number, since it uses less digits than its factorization.

51204312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598 (or 2585 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51204312 is about 7155.7188318156. The cubic root of 51204312 is about 371.3375306313.

Adding to 51204312 its reverse (21340215), we get a palindrome (72544527).

The spelling of 51204312 in words is "fifty-one million, two hundred four thousand, three hundred twelve".