50905891 has 4 divisors (see below), whose sum is σ = 51430792. Its totient is φ = 50380992.

The previous prime is 50905889. The next prime is 50905909. The reversal of 50905891 is 19850905.

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 50905891 - 2¹ = 50905889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 50905891.

It is not an unprimeable number, because it can be changed into a prime (50905801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262305 + ... + 262498.

It is an arithmetic number, because the mean of its divisors is an integer number (12857698).

Almost surely, 2^50905891 is an apocalyptic number.

50905891 is a deficient number, since it is larger than the sum of its proper divisors (524901).

50905891 is an equidigital number, since it uses as much as digits as its factorization.

50905891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524900.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 50905891 is about 7134.8364382094. The cubic root of 50905891 is about 370.6147341146.

The spelling of 50905891 in words is "fifty million, nine hundred five thousand, eight hundred ninety-one".