51111144 has 48 divisors (see below), whose sum is σ = 158202720. Its totient is φ = 14603040.

The previous prime is 51111139. The next prime is 51111149. The reversal of 51111144 is 44111115.

51111144 is a `hidden beast` number, since 511 + 11 + 144 = 666.

51111144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51111139) and next prime (51111149).

It is a super-2 number, since 2×51111144² = 5224698081977472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51111149) 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 11 ways as a sum of consecutive naturals, for example, 50202 + ... + 51209.

It is an arithmetic number, because the mean of its divisors is an integer number (3295890).

Almost surely, 2^51111144 is an apocalyptic number.

It is an amenable number.

51111144 is an abundant number, since it is smaller than the sum of its proper divisors (107091576).

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

51111144 is a wasteful number, since it uses less digits than its factorization.

51111144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101430 (or 101423 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 51111144 is about 7149.2058300206. The cubic root of 51111144 is about 371.1121734412.

Adding to 51111144 its reverse (44111115), we get a palindrome (95222259).

The spelling of 51111144 in words is "fifty-one million, one hundred eleven thousand, one hundred forty-four".