505420025 has 18 divisors (see below), whose sum is σ = 688879086. Its totient is φ = 367576000.

The previous prime is 505419983. The next prime is 505420039. The reversal of 505420025 is 520024505.

It can be written as a sum of positive squares in 3 ways, for example, as 15594601 + 489825424 = 3949^2 + 22132^2 .

It is a de Polignac number, because none of the positive numbers 2^k-505420025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 80516 + ... + 86565.

Almost surely, 2^505420025 is an apocalyptic number.

505420025 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

505420025 is a deficient number, since it is larger than the sum of its proper divisors (183459061).

505420025 is a wasteful number, since it uses less digits than its factorization.

505420025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167113 (or 167097 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 505420025 is about 22481.5485454183. The cubic root of 505420025 is about 796.5581429488.

The spelling of 505420025 in words is "five hundred five million, four hundred twenty thousand, twenty-five".