505491 has 8 divisors (see below), whose sum is σ = 770304. Its totient is φ = 288840.

The previous prime is 505481. The next prime is 505493. The reversal of 505491 is 194505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 505491 - 2⁵ = 505459 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

505491 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 505491.

It is not an unprimeable number, because it can be changed into a prime (505493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12015 + ... + 12056.

It is an arithmetic number, because the mean of its divisors is an integer number (96288).

2⁵⁰⁵⁴⁹¹ is an apocalyptic number.

505491 is a deficient number, since it is larger than the sum of its proper divisors (264813).

505491 is a wasteful number, since it uses less digits than its factorization.

505491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24081.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 505491 is about 710.9789026406. The cubic root of 505491 is about 79.6595427494.

Adding to 505491 its sum of digits (24), we get a triangular number (505515 = T₁₀₀₅).

Adding to 505491 its reverse (194505), we get a palindrome (699996).

The spelling of 505491 in words is "five hundred five thousand, four hundred ninety-one".