51081144 has 16 divisors (see below), whose sum is σ = 127702920. Its totient is φ = 17027040.

The previous prime is 51081143. The next prime is 51081157. The reversal of 51081144 is 44118015.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 2128381 = 51081144 / (5 + 1 + 0 + 8 + 1 + 1 + 4 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51081143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064167 + ... + 1064214.

Almost surely, 2^51081144 is an apocalyptic number.

It is an amenable number.

51081144 is an abundant number, since it is smaller than the sum of its proper divisors (76621776).

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

51081144 is a wasteful number, since it uses less digits than its factorization.

51081144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128390 (or 2128386 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 51081144 is about 7147.1073869084. The cubic root of 51081144 is about 371.0395503737.

Adding to 51081144 its reverse (44118015), we get a palindrome (95199159).

The spelling of 51081144 in words is "fifty-one million, eighty-one thousand, one hundred forty-four".