505221413 has 4 divisors (see below), whose sum is σ = 506576268. Its totient is φ = 503866560.

The previous prime is 505221407. The next prime is 505221439. The reversal of 505221413 is 314122505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 198866404 + 306355009 = 14102^2 + 17503^2 .

It is a cyclic number.

It is not a de Polignac number, because 505221413 - 2⁴ = 505221397 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 (505221443) 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, 676868 + ... + 677613.

It is an arithmetic number, because the mean of its divisors is an integer number (126644067).

Almost surely, 2^505221413 is an apocalyptic number.

It is an amenable number.

505221413 is a deficient number, since it is larger than the sum of its proper divisors (1354855).

505221413 is a wasteful number, since it uses less digits than its factorization.

505221413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354854.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 505221413 is about 22477.1308889725. The cubic root of 505221413 is about 796.4537896547.

Adding to 505221413 its reverse (314122505), we get a palindrome (819343918).

The spelling of 505221413 in words is "five hundred five million, two hundred twenty-one thousand, four hundred thirteen".