505359409 has 2 divisors, whose sum is σ = 505359410. Its totient is φ = 505359408.

The previous prime is 505359383. The next prime is 505359433. The reversal of 505359409 is 904953505.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380367009 + 124992400 = 19503^2 + 11180^2 .

It is a cyclic number.

It is not a de Polignac number, because 505359409 - 2¹⁷ = 505228337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505359479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252679704 + 252679705.

It is an arithmetic number, because the mean of its divisors is an integer number (252679705).

Almost surely, 2^505359409 is an apocalyptic number.

It is an amenable number.

505359409 is a deficient number, since it is larger than the sum of its proper divisors (1).

505359409 is an equidigital number, since it uses as much as digits as its factorization.

505359409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 505359409 is about 22480.2003772208. The cubic root of 505359409 is about 796.5262974233.

The spelling of 505359409 in words is "five hundred five million, three hundred fifty-nine thousand, four hundred nine".