51491124 has 144 divisors (see below), whose sum is σ = 146065920. Its totient is φ = 15240960.

The previous prime is 51491119. The next prime is 51491149. The reversal of 51491124 is 42119415.

51491124 is a `hidden beast` number, since 51 + 491 + 124 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1197447 + ... + 1197489.

Almost surely, 2^51491124 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 51491124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73032960).

51491124 is an abundant number, since it is smaller than the sum of its proper divisors (94574796).

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

51491124 is a wasteful number, since it uses less digits than its factorization.

51491124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 145 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 51491124 is about 7175.7316003318. The cubic root of 51491124 is about 372.0295675423.

It can be divided in two parts, 51491 and 124, that added together give a palindrome (51615).

The spelling of 51491124 in words is "fifty-one million, four hundred ninety-one thousand, one hundred twenty-four".