51443139 has 32 divisors (see below), whose sum is σ = 80061696. Its totient is φ = 29035520.

The previous prime is 51443123. The next prime is 51443143. The reversal of 51443139 is 93134415.

51443139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51443139 - 2⁴ = 51443123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51448139) 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 31 ways as a sum of consecutive naturals, for example, 59599 + ... + 60455.

It is an arithmetic number, because the mean of its divisors is an integer number (2501928).

Almost surely, 2^51443139 is an apocalyptic number.

51443139 is a deficient number, since it is larger than the sum of its proper divisors (28618557).

51443139 is a wasteful number, since it uses less digits than its factorization.

51443139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995.

The product of its digits is 6480, while the sum is 30.

The square root of 51443139 is about 7172.3872594834. The cubic root of 51443139 is about 371.9139658249.

The spelling of 51443139 in words is "fifty-one million, four hundred forty-three thousand, one hundred thirty-nine".