51505212 has 24 divisors (see below), whose sum is σ = 131104512. Its totient is φ = 15607600.

The previous prime is 51505183. The next prime is 51505213. The reversal of 51505212 is 21250515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51505213) 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, 194964 + ... + 195227.

It is an arithmetic number, because the mean of its divisors is an integer number (5462688).

Almost surely, 2^51505212 is an apocalyptic number.

It is an amenable number.

51505212 is an abundant number, since it is smaller than the sum of its proper divisors (79599300).

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

51505212 is a wasteful number, since it uses less digits than its factorization.

51505212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390209 (or 390207 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51505212 is about 7176.7131752635. The cubic root of 51505212 is about 372.0634936136.

Adding to 51505212 its reverse (21250515), we get a palindrome (72755727).

The spelling of 51505212 in words is "fifty-one million, five hundred five thousand, two hundred twelve".