51212252 has 72 divisors (see below), whose sum is σ = 113954400. Its totient is φ = 19958400.

The previous prime is 51212221. The next prime is 51212261. The reversal of 51212252 is 25221215.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 257249 + ... + 257447.

It is an arithmetic number, because the mean of its divisors is an integer number (1582700).

Almost surely, 2^51212252 is an apocalyptic number.

51212252 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51212252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56977200).

51212252 is an abundant number, since it is smaller than the sum of its proper divisors (62742148).

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

51212252 is a wasteful number, since it uses less digits than its factorization.

51212252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331 (or 322 counting only the distinct ones).

The product of its digits is 400, while the sum is 20.

The square root of 51212252 is about 7156.2736113148. The cubic root of 51212252 is about 371.3567234655.

Adding to 51212252 its reverse (25221215), we get a palindrome (76433467).

The spelling of 51212252 in words is "fifty-one million, two hundred twelve thousand, two hundred fifty-two".