51989843 has 2 divisors, whose sum is σ = 51989844. Its totient is φ = 51989842.

The previous prime is 51989809. The next prime is 51989869. The reversal of 51989843 is 34898915.

51989843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51989843 - 2¹⁰ = 51988819 is a prime.

It is not a weakly prime, because it can be changed into another prime (51989803) 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 as a sum of consecutive naturals, namely, 25994921 + 25994922.

It is an arithmetic number, because the mean of its divisors is an integer number (25994922).

Almost surely, 2^51989843 is an apocalyptic number.

51989843 is a deficient number, since it is larger than the sum of its proper divisors (1).

51989843 is an equidigital number, since it uses as much as digits as its factorization.

51989843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 47.

The square root of 51989843 is about 7210.3982552977. The cubic root of 51989843 is about 373.2268121020.

The spelling of 51989843 in words is "fifty-one million, nine hundred eighty-nine thousand, eight hundred forty-three".