505104217 has 4 divisors (see below), whose sum is σ = 513384676. Its totient is φ = 496823760.

The previous prime is 505104209. The next prime is 505104233. The reversal of 505104217 is 712401505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712401505 = 5 ⋅142480301.

It can be written as a sum of positive squares in 2 ways, for example, as 73462041 + 431642176 = 8571^2 + 20776^2 .

It is a cyclic number.

It is not a de Polignac number, because 505104217 - 2³ = 505104209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505104191 and 505104200.

It is not an unprimeable number, because it can be changed into a prime (505104247) 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, 4140138 + ... + 4140259.

It is an arithmetic number, because the mean of its divisors is an integer number (128346169).

Almost surely, 2^505104217 is an apocalyptic number.

It is an amenable number.

505104217 is a deficient number, since it is larger than the sum of its proper divisors (8280459).

505104217 is an equidigital number, since it uses as much as digits as its factorization.

505104217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8280458.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 505104217 is about 22474.5237324398. The cubic root of 505104217 is about 796.3922005413.

The spelling of 505104217 in words is "five hundred five million, one hundred four thousand, two hundred seventeen".