506191 has 4 divisors (see below), whose sum is σ = 578512. Its totient is φ = 433872.

The previous prime is 506183. The next prime is 506201. The reversal of 506191 is 191605.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191605 = 5 ⋅38321.

It is a cyclic number.

It is not a de Polignac number, because 506191 - 2³ = 506183 is a prime.

It is a Duffinian number.

506191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506101) 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, 36150 + ... + 36163.

It is an arithmetic number, because the mean of its divisors is an integer number (144628).

2⁵⁰⁶¹⁹¹ is an apocalyptic number.

506191 is a deficient number, since it is larger than the sum of its proper divisors (72321).

506191 is an equidigital number, since it uses as much as digits as its factorization.

506191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72320.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 506191 is about 711.4710113560. The cubic root of 506191 is about 79.6962964274.

Adding to 506191 its reverse (191605), we get a palindrome (697796).

It can be divided in two parts, 50 and 6191, that added together give a square (6241 = 79²).

The spelling of 506191 in words is "five hundred six thousand, one hundred ninety-one".