505506521 has 16 divisors (see below), whose sum is σ = 551040000. Its totient is φ = 460961280.

The previous prime is 505506499. The next prime is 505506523. The reversal of 505506521 is 125605505.

It is a de Polignac number, because none of the positive numbers 2^k-505506521 is a prime.

It is a super-3 number, since 3×505506521³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505506523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 404105 + ... + 405353.

It is an arithmetic number, because the mean of its divisors is an integer number (34440000).

Almost surely, 2^505506521 is an apocalyptic number.

It is an amenable number.

505506521 is a deficient number, since it is larger than the sum of its proper divisors (45533479).

505506521 is a wasteful number, since it uses less digits than its factorization.

505506521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

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

The square root of 505506521 is about 22483.4721740215. The cubic root of 505506521 is about 796.6035805121.

The spelling of 505506521 in words is "five hundred five million, five hundred six thousand, five hundred twenty-one".