50521991 has 4 divisors (see below), whose sum is σ = 54408312. Its totient is φ = 46635672.

The previous prime is 50521981. The next prime is 50521993. The reversal of 50521991 is 19912505.

50521991 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 50521991 - 2⁶ = 50521927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50521993) 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, 1943141 + ... + 1943166.

It is an arithmetic number, because the mean of its divisors is an integer number (13602078).

Almost surely, 2^50521991 is an apocalyptic number.

50521991 is a deficient number, since it is larger than the sum of its proper divisors (3886321).

50521991 is a wasteful number, since it uses less digits than its factorization.

50521991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886320.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 50521991 is about 7107.8823147264. The cubic root of 50521991 is about 369.6807350624.

The spelling of 50521991 in words is "fifty million, five hundred twenty-one thousand, nine hundred ninety-one".