505398125 has 10 divisors (see below), whose sum is σ = 631546278. Its totient is φ = 404318000.

The previous prime is 505398121. The next prime is 505398137. The reversal of 505398125 is 521893505.

It can be written as a sum of positive squares in 5 ways, for example, as 153685609 + 351712516 = 12397^2 + 18754^2 .

It is not a de Polignac number, because 505398125 - 2² = 505398121 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505398121) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 403694 + ... + 404943.

Almost surely, 2^505398125 is an apocalyptic number.

It is an amenable number.

505398125 is a deficient number, since it is larger than the sum of its proper divisors (126148153).

505398125 is an frugal number, since it uses more digits than its factorization.

505398125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808657 (or 808642 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The square root of 505398125 is about 22481.0614740497. The cubic root of 505398125 is about 796.5466377488.

The spelling of 505398125 in words is "five hundred five million, three hundred ninety-eight thousand, one hundred twenty-five".