505530493 has 4 divisors (see below), whose sum is σ = 544417468. Its totient is φ = 466643520.

The previous prime is 505530481. The next prime is 505530503. The reversal of 505530493 is 394035505.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 394035505 = 5 ⋅78807101.

It can be written as a sum of positive squares in 2 ways, for example, as 119290084 + 386240409 = 10922^2 + 19653^2 .

It is a cyclic number.

It is not a de Polignac number, because 505530493 - 2⁵ = 505530461 is a prime.

It is a super-2 number, since 2×505530493² = 511122158705646098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505530463) 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, 19443468 + ... + 19443493.

It is an arithmetic number, because the mean of its divisors is an integer number (136104367).

Almost surely, 2^505530493 is an apocalyptic number.

It is an amenable number.

505530493 is a deficient number, since it is larger than the sum of its proper divisors (38886975).

505530493 is a wasteful number, since it uses less digits than its factorization.

505530493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38886974.

The product of its (nonzero) digits is 40500, while the sum is 34.

The square root of 505530493 is about 22484.0052704139. The cubic root of 505530493 is about 796.6161724229.

Adding to 505530493 its reverse (394035505), we get a palindrome (899565998).

The spelling of 505530493 in words is "five hundred five million, five hundred thirty thousand, four hundred ninety-three".