505743221 has 4 divisors (see below), whose sum is σ = 514315200. Its totient is φ = 497171244.

The previous prime is 505743211. The next prime is 505743223. The reversal of 505743221 is 122347505.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505743221 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 (505743223) 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, 4285901 + ... + 4286018.

It is an arithmetic number, because the mean of its divisors is an integer number (128578800).

Almost surely, 2^505743221 is an apocalyptic number.

It is an amenable number.

505743221 is a deficient number, since it is larger than the sum of its proper divisors (8571979).

505743221 is an equidigital number, since it uses as much as digits as its factorization.

505743221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8571978.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 505743221 is about 22488.7354246520. The cubic root of 505743221 is about 796.7278958521.

The spelling of 505743221 in words is "five hundred five million, seven hundred forty-three thousand, two hundred twenty-one".