505013321 has 2 divisors, whose sum is σ = 505013322. Its totient is φ = 505013320.

The previous prime is 505013317. The next prime is 505013363. The reversal of 505013321 is 123310505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 258052096 + 246961225 = 16064^2 + 15715^2 .

It is a cyclic number.

It is not a de Polignac number, because 505013321 - 2² = 505013317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 505013293 and 505013302.

It is not a weakly prime, because it can be changed into another prime (505013021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252506660 + 252506661.

It is an arithmetic number, because the mean of its divisors is an integer number (252506661).

Almost surely, 2^505013321 is an apocalyptic number.

It is an amenable number.

505013321 is a deficient number, since it is larger than the sum of its proper divisors (1).

505013321 is an equidigital number, since it uses as much as digits as its factorization.

505013321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 505013321 is about 22472.5014406496. The cubic root of 505013321 is about 796.3444261047.

Adding to 505013321 its reverse (123310505), we get a palindrome (628323826).

The spelling of 505013321 in words is "five hundred five million, thirteen thousand, three hundred twenty-one".