505215191 has 18 divisors (see below), whose sum is σ = 555236640. Its totient is φ = 459488016.

The previous prime is 505215157. The next prime is 505215209. The reversal of 505215191 is 191512505.

It is not a de Polignac number, because 505215191 - 2¹⁰ = 505214167 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 (505215121) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1054490 + ... + 1054968.

It is an arithmetic number, because the mean of its divisors is an integer number (30846480).

Almost surely, 2^505215191 is an apocalyptic number.

505215191 is a deficient number, since it is larger than the sum of its proper divisors (50021449).

505215191 is an equidigital number, since it uses as much as digits as its factorization.

505215191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 571 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 29.

The square root of 505215191 is about 22476.9924812017. The cubic root of 505215191 is about 796.4505200943.

Adding to 505215191 its reverse (191512505), we get a palindrome (696727696).

The spelling of 505215191 in words is "five hundred five million, two hundred fifteen thousand, one hundred ninety-one".