51245250 has 128 divisors (see below), whose sum is σ = 150239232. Its totient is φ = 11390400.

The previous prime is 51245237. The next prime is 51245273. The reversal of 51245250 is 5254215.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51245250.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 225637 + ... + 225863.

It is an arithmetic number, because the mean of its divisors is an integer number (1173744).

Almost surely, 2^51245250 is an apocalyptic number.

51245250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51245250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75119616).

51245250 is an abundant number, since it is smaller than the sum of its proper divisors (98993982).

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

51245250 is a wasteful number, since it uses less digits than its factorization.

51245250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 51245250 is about 7158.5787695603. The cubic root of 51245250 is about 371.4364660903.

Adding to 51245250 its reverse (5254215), we get a palindrome (56499465).

The spelling of 51245250 in words is "fifty-one million, two hundred forty-five thousand, two hundred fifty".