505387217 has 4 divisors (see below), whose sum is σ = 505521060. Its totient is φ = 505253376.

The previous prime is 505387177. The next prime is 505387219. The reversal of 505387217 is 712783505.

It is a happy number.

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 325585936 + 179801281 = 18044^2 + 13409^2 .

It is a cyclic number.

It is not a de Polignac number, because 505387217 - 2²⁶ = 438278353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505387219) 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, 61088 + ... + 68865.

It is an arithmetic number, because the mean of its divisors is an integer number (126380265).

Almost surely, 2^505387217 is an apocalyptic number.

It is an amenable number.

505387217 is a deficient number, since it is larger than the sum of its proper divisors (133843).

505387217 is a wasteful number, since it uses less digits than its factorization.

505387217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133842.

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 505387217 is about 22480.8188685377. The cubic root of 505387217 is about 796.5409070897.

The spelling of 505387217 in words is "five hundred five million, three hundred eighty-seven thousand, two hundred seventeen".