50891639 has 4 divisors (see below), whose sum is σ = 50977200. Its totient is φ = 50806080.

The previous prime is 50891611. The next prime is 50891641. The reversal of 50891639 is 93619805.

50891639 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 50891639 - 2⁸ = 50891383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 50891596 and 50891605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50891039) 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, 41882 + ... + 43079.

It is an arithmetic number, because the mean of its divisors is an integer number (12744300).

Almost surely, 2^50891639 is an apocalyptic number.

50891639 is a deficient number, since it is larger than the sum of its proper divisors (85561).

50891639 is an equidigital number, since it uses as much as digits as its factorization.

50891639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85560.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 50891639 is about 7133.8376067864. The cubic root of 50891639 is about 370.5801441808.

The spelling of 50891639 in words is "fifty million, eight hundred ninety-one thousand, six hundred thirty-nine".