51311424 has 56 divisors (see below), whose sum is σ = 136611360. Its totient is φ = 16996864.

The previous prime is 51311401. The next prime is 51311441. The reversal of 51311424 is 42411315.

It is a self number, because there is not a number n which added to its sum of digits gives 51311424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33622 + ... + 35114.

Almost surely, 2^51311424 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 51311424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68305680).

51311424 is an abundant number, since it is smaller than the sum of its proper divisors (85299936).

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

51311424 is a wasteful number, since it uses less digits than its factorization.

51311424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687 (or 1677 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 51311424 is about 7163.1992852356. The cubic root of 51311424 is about 371.5962783937.

Adding to 51311424 its reverse (42411315), we get a palindrome (93722739).

It can be divided in two parts, 5131 and 1424, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 51311424 in words is "fifty-one million, three hundred eleven thousand, four hundred twenty-four".