505472321 has 4 divisors (see below), whose sum is σ = 513016752. Its totient is φ = 497927892.

The previous prime is 505472309. The next prime is 505472347. The reversal of 505472321 is 123274505.

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 not a de Polignac number, because 505472321 - 2¹⁰ = 505471297 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505472351) 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, 3772115 + ... + 3772248.

It is an arithmetic number, because the mean of its divisors is an integer number (128254188).

Almost surely, 2^505472321 is an apocalyptic number.

It is an amenable number.

505472321 is a deficient number, since it is larger than the sum of its proper divisors (7544431).

505472321 is an equidigital number, since it uses as much as digits as its factorization.

505472321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7544430.

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

The square root of 505472321 is about 22482.7116024736. The cubic root of 505472321 is about 796.5856153914.

The spelling of 505472321 in words is "five hundred five million, four hundred seventy-two thousand, three hundred twenty-one".