51239443 has 2 divisors, whose sum is σ = 51239444. Its totient is φ = 51239442.

The previous prime is 51239417. The next prime is 51239453. The reversal of 51239443 is 34493215.

51239443 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 51239443 - 2⁹ = 51238931 is a prime.

It is not a weakly prime, because it can be changed into another prime (51239453) 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, 25619721 + 25619722.

It is an arithmetic number, because the mean of its divisors is an integer number (25619722).

Almost surely, 2^51239443 is an apocalyptic number.

51239443 is a deficient number, since it is larger than the sum of its proper divisors (1).

51239443 is an equidigital number, since it uses as much as digits as its factorization.

51239443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 51239443 is about 7158.1731608002. The cubic root of 51239443 is about 371.4224354368.

The spelling of 51239443 in words is "fifty-one million, two hundred thirty-nine thousand, four hundred forty-three".