51989143 has 4 divisors (see below), whose sum is σ = 52074568. Its totient is φ = 51903720.

The previous prime is 51989123. The next prime is 51989159. The reversal of 51989143 is 34198915.

51989143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51989143 - 2⁹ = 51988631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51989096 and 51989105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51989123) 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 3 ways as a sum of consecutive naturals, for example, 41793 + ... + 43018.

It is an arithmetic number, because the mean of its divisors is an integer number (13018642).

Almost surely, 2^51989143 is an apocalyptic number.

51989143 is a deficient number, since it is larger than the sum of its proper divisors (85425).

51989143 is an equidigital number, since it uses as much as digits as its factorization.

51989143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85424.

The product of its digits is 38880, while the sum is 40.

The square root of 51989143 is about 7210.3497141262. The cubic root of 51989143 is about 373.2251370316.

It can be divided in two parts, 5198 and 9143, that added together give a palindrome (14341).

The spelling of 51989143 in words is "fifty-one million, nine hundred eighty-nine thousand, one hundred forty-three".