505506289 has 4 divisors (see below), whose sum is σ = 506002420. Its totient is φ = 505010160.

The previous prime is 505506233. The next prime is 505506293. The reversal of 505506289 is 982605505.

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 430977600 + 74528689 = 20760^2 + 8633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505506289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505506389) 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, 246534 + ... + 248575.

It is an arithmetic number, because the mean of its divisors is an integer number (126500605).

Almost surely, 2^505506289 is an apocalyptic number.

It is an amenable number.

505506289 is a deficient number, since it is larger than the sum of its proper divisors (496131).

505506289 is a wasteful number, since it uses less digits than its factorization.

505506289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496130.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 505506289 is about 22483.4670146755. The cubic root of 505506289 is about 796.6034586461.

The spelling of 505506289 in words is "five hundred five million, five hundred six thousand, two hundred eighty-nine".