505512521 has 4 divisors (see below), whose sum is σ = 513057552. Its totient is φ = 497967492.

The previous prime is 505512481. The next prime is 505512523. The reversal of 505512521 is 125215505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505512521 - 2⁶ = 505512457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505512523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3772415 + ... + 3772548.

It is an arithmetic number, because the mean of its divisors is an integer number (128264388).

Almost surely, 2^505512521 is an apocalyptic number.

It is an amenable number.

505512521 is a deficient number, since it is larger than the sum of its proper divisors (7545031).

505512521 is an equidigital number, since it uses as much as digits as its factorization.

505512521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7545030.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 505512521 is about 22483.6056049736. The cubic root of 505512521 is about 796.6067322041.

It can be divided in two parts, 5055 and 12521, that added together give a cube (17576 = 26³).

The spelling of 505512521 in words is "five hundred five million, five hundred twelve thousand, five hundred twenty-one".