505605521 has 4 divisors (see below), whose sum is σ = 506105652. Its totient is φ = 505105392.

The previous prime is 505605511. The next prime is 505605533. The reversal of 505605521 is 125506505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125506505 = 5 ⋅25101301.

It can be written as a sum of positive squares in 2 ways, for example, as 3845521 + 501760000 = 1961^2 + 22400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505605521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505605511) 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, 248546 + ... + 250571.

It is an arithmetic number, because the mean of its divisors is an integer number (126526413).

Almost surely, 2^505605521 is an apocalyptic number.

It is an amenable number.

505605521 is a deficient number, since it is larger than the sum of its proper divisors (500131).

505605521 is a wasteful number, since it uses less digits than its factorization.

505605521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500130.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 505605521 is about 22485.6736834812. The cubic root of 505605521 is about 796.6555802413.

The spelling of 505605521 in words is "five hundred five million, six hundred five thousand, five hundred twenty-one".