51731244 has 96 divisors (see below), whose sum is σ = 141120000. Its totient is φ = 16365888.

The previous prime is 51731237. The next prime is 51731249. The reversal of 51731244 is 44213715.

51731244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51731244² = 5352243211575072, which contains 22 as substring.

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 (51731249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 259857 + ... + 260055.

It is an arithmetic number, because the mean of its divisors is an integer number (1470000).

Almost surely, 2^51731244 is an apocalyptic number.

51731244 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 51731244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70560000).

51731244 is an abundant number, since it is smaller than the sum of its proper divisors (89388756).

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

51731244 is a wasteful number, since it uses less digits than its factorization.

51731244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 316 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 51731244 is about 7192.4435347106. The cubic root of 51731244 is about 372.6069695642.

Adding to 51731244 its reverse (44213715), we get a palindrome (95944959).

The spelling of 51731244 in words is "fifty-one million, seven hundred thirty-one thousand, two hundred forty-four".