505523653 has 4 divisors (see below), whose sum is σ = 513810988. Its totient is φ = 497236320.

The previous prime is 505523639. The next prime is 505523657. The reversal of 505523653 is 356325505.

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 20775364 + 484748289 = 4558^2 + 22017^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505523653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505523657) 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, 4143576 + ... + 4143697.

It is an arithmetic number, because the mean of its divisors is an integer number (128452747).

Almost surely, 2^505523653 is an apocalyptic number.

It is an amenable number.

505523653 is a deficient number, since it is larger than the sum of its proper divisors (8287335).

505523653 is an equidigital number, since it uses as much as digits as its factorization.

505523653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8287334.

The product of its (nonzero) digits is 67500, while the sum is 34.

The square root of 505523653 is about 22483.8531617692. The cubic root of 505523653 is about 796.6125795772.

The spelling of 505523653 in words is "five hundred five million, five hundred twenty-three thousand, six hundred fifty-three".