505445321 has 8 divisors (see below), whose sum is σ = 523126080. Its totient is φ = 487781392.

The previous prime is 505445299. The next prime is 505445323. The reversal of 505445321 is 123544505.

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

It is not a de Polignac number, because 505445321 - 2⁶ = 505445257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505445323) 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, 107996 + ... + 112578.

It is an arithmetic number, because the mean of its divisors is an integer number (65390760).

Almost surely, 2^505445321 is an apocalyptic number.

It is an amenable number.

505445321 is a deficient number, since it is larger than the sum of its proper divisors (17680759).

505445321 is a wasteful number, since it uses less digits than its factorization.

505445321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8415.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 505445321 is about 22482.1111330764. Note that the first 4 decimals coincide. The cubic root of 505445321 is about 796.5714318291.

Adding to 505445321 its reverse (123544505), we get a palindrome (628989826).

The spelling of 505445321 in words is "five hundred five million, four hundred forty-five thousand, three hundred twenty-one".