51181424 has 40 divisors (see below), whose sum is σ = 120001248. Its totient is φ = 20643840.

The previous prime is 51181423. The next prime is 51181451. The reversal of 51181424 is 42418115.

It is a junction number, because it is equal to n+sod(n) for n = 51181393 and 51181402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51181423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11537 + ... + 15344.

Almost surely, 2^51181424 is an apocalyptic number.

It is an amenable number.

51181424 is an abundant number, since it is smaller than the sum of its proper divisors (68819824).

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

51181424 is a wasteful number, since it uses less digits than its factorization.

51181424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26913 (or 26907 counting only the distinct ones).

The product of its digits is 1280, while the sum is 26.

The square root of 51181424 is about 7154.1193727810. The cubic root of 51181424 is about 371.2821938850.

Adding to 51181424 its reverse (42418115), we get a palindrome (93599539).

The spelling of 51181424 in words is "fifty-one million, one hundred eighty-one thousand, four hundred twenty-four".