50919191 has 4 divisors (see below), whose sum is σ = 51063792. Its totient is φ = 50774592.

The previous prime is 50919173. The next prime is 50919229. The reversal of 50919191 is 19191905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19191905 = 5 ⋅3838381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50919191 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 (50919161) 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, 71771 + ... + 72476.

It is an arithmetic number, because the mean of its divisors is an integer number (12765948).

Almost surely, 2^50919191 is an apocalyptic number.

50919191 is a deficient number, since it is larger than the sum of its proper divisors (144601).

50919191 is a wasteful number, since it uses less digits than its factorization.

50919191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144600.

The product of its (nonzero) digits is 3645, while the sum is 35.

The square root of 50919191 is about 7135.7684239331. The cubic root of 50919191 is about 370.6470076993.

The spelling of 50919191 in words is "fifty million, nine hundred nineteen thousand, one hundred ninety-one".