51281244 has 72 divisors (see below), whose sum is σ = 151205600. Its totient is φ = 14648256.

The previous prime is 51281239. The next prime is 51281257. The reversal of 51281244 is 44218215.

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, 10272 + ... + 14424.

Almost surely, 2^51281244 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 51281244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75602800).

51281244 is an abundant number, since it is smaller than the sum of its proper divisors (99924356).

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

51281244 is a wasteful number, since it uses less digits than its factorization.

51281244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4184 (or 4165 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 51281244 is about 7161.0923747708. The cubic root of 51281244 is about 371.5234097921.

Adding to 51281244 its reverse (44218215), we get a palindrome (95499459).

The spelling of 51281244 in words is "fifty-one million, two hundred eighty-one thousand, two hundred forty-four".