505836321 has 4 divisors (see below), whose sum is σ = 674448432. Its totient is φ = 337224212.

The previous prime is 505836319. The next prime is 505836337. The reversal of 505836321 is 123638505.

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 505836321 - 2¹ = 505836319 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (505836371) 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, 84306051 + ... + 84306056.

It is an arithmetic number, because the mean of its divisors is an integer number (168612108).

Almost surely, 2^505836321 is an apocalyptic number.

It is an amenable number.

505836321 is a deficient number, since it is larger than the sum of its proper divisors (168612111).

505836321 is a wasteful number, since it uses less digits than its factorization.

505836321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168612110.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 505836321 is about 22490.8052545924. The cubic root of 505836321 is about 796.7767815401.

The spelling of 505836321 in words is "five hundred five million, eight hundred thirty-six thousand, three hundred twenty-one".