505243213 has 8 divisors (see below), whose sum is σ = 538058808. Its totient is φ = 472771584.

The previous prime is 505243201. The next prime is 505243217. The reversal of 505243213 is 312342505.

It can be written as a sum of positive squares in 4 ways, for example, as 355963689 + 149279524 = 18867^2 + 12218^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 505243213 - 2¹³ = 505235021 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 (505243217) 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, 82956 + ... + 88837.

It is an arithmetic number, because the mean of its divisors is an integer number (67257351).

Almost surely, 2^505243213 is an apocalyptic number.

It is an amenable number.

505243213 is a deficient number, since it is larger than the sum of its proper divisors (32815595).

505243213 is a wasteful number, since it uses less digits than its factorization.

505243213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171983.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 505243213 is about 22477.6158210785. The cubic root of 505243213 is about 796.4652449905.

Adding to 505243213 its reverse (312342505), we get a palindrome (817585718).

The spelling of 505243213 in words is "five hundred five million, two hundred forty-three thousand, two hundred thirteen".