505085921 has 2 divisors, whose sum is σ = 505085922. Its totient is φ = 505085920.

The previous prime is 505085897. The next prime is 505085993. The reversal of 505085921 is 129580505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386515600 + 118570321 = 19660^2 + 10889^2 .

It is a cyclic number.

It is not a de Polignac number, because 505085921 - 2¹⁰ = 505084897 is a prime.

It is a super-2 number, since 2×505085921² = 510223575184836482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505085621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252542960 + 252542961.

It is an arithmetic number, because the mean of its divisors is an integer number (252542961).

Almost surely, 2^505085921 is an apocalyptic number.

It is an amenable number.

505085921 is a deficient number, since it is larger than the sum of its proper divisors (1).

505085921 is an equidigital number, since it uses as much as digits as its factorization.

505085921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 505085921 is about 22474.1166900949. The cubic root of 505085921 is about 796.3825847253.

The spelling of 505085921 in words is "five hundred five million, eighty-five thousand, nine hundred twenty-one".