505660361 has 4 divisors (see below), whose sum is σ = 505764372. Its totient is φ = 505556352.

The previous prime is 505660303. The next prime is 505660381. The reversal of 505660361 is 163066505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87703225 + 417957136 = 9365^2 + 20444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505660361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505660301) 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, 44336 + ... + 54561.

It is an arithmetic number, because the mean of its divisors is an integer number (126441093).

Almost surely, 2^505660361 is an apocalyptic number.

It is an amenable number.

505660361 is a deficient number, since it is larger than the sum of its proper divisors (104011).

505660361 is an equidigital number, since it uses as much as digits as its factorization.

505660361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104010.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 505660361 is about 22486.8930935334. The cubic root of 505660361 is about 796.6843820184.

The spelling of 505660361 in words is "five hundred five million, six hundred sixty thousand, three hundred sixty-one".