51751224 has 96 divisors (see below), whose sum is σ = 166158720. Its totient is φ = 14782176.

The previous prime is 51751223. The next prime is 51751237. The reversal of 51751224 is 42215715.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51751223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11707 + ... + 15509.

It is an arithmetic number, because the mean of its divisors is an integer number (1730820).

Almost surely, 2^51751224 is an apocalyptic number.

51751224 is a gapful number since it is divisible by the number (54) 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 51751224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83079360).

51751224 is an abundant number, since it is smaller than the sum of its proper divisors (114407496).

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

51751224 is a wasteful number, since it uses less digits than its factorization.

51751224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831 (or 3815 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 51751224 is about 7193.8323583470. The cubic root of 51751224 is about 372.6549336728.

Adding to 51751224 its reverse (42215715), we get a palindrome (93966939).

The spelling of 51751224 in words is "fifty-one million, seven hundred fifty-one thousand, two hundred twenty-four".