505005521 has 2 divisors, whose sum is σ = 505005522. Its totient is φ = 505005520.

The previous prime is 505005517. The next prime is 505005559. The reversal of 505005521 is 125500505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357625921 + 147379600 = 18911^2 + 12140^2 .

It is a cyclic number.

It is not a de Polignac number, because 505005521 - 2² = 505005517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505005581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252502760 + 252502761.

It is an arithmetic number, because the mean of its divisors is an integer number (252502761).

Almost surely, 2^505005521 is an apocalyptic number.

It is an amenable number.

505005521 is a deficient number, since it is larger than the sum of its proper divisors (1).

505005521 is an equidigital number, since it uses as much as digits as its factorization.

505005521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 505005521 is about 22472.3278945462. The cubic root of 505005521 is about 796.3403262006.

The spelling of 505005521 in words is "five hundred five million, five thousand, five hundred twenty-one".