505431205 has 4 divisors (see below), whose sum is σ = 606517452. Its totient is φ = 404344960.

The previous prime is 505431193. The next prime is 505431209. The reversal of 505431205 is 502134505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60980481 + 444450724 = 7809^2 + 21082^2 .

It is not a de Polignac number, because 505431205 - 2⁷ = 505431077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505431205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505431209) 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, 50543116 + ... + 50543125.

It is an arithmetic number, because the mean of its divisors is an integer number (151629363).

Almost surely, 2^505431205 is an apocalyptic number.

It is an amenable number.

505431205 is a deficient number, since it is larger than the sum of its proper divisors (101086247).

505431205 is a wasteful number, since it uses less digits than its factorization.

505431205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101086246.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 505431205 is about 22481.7971923955. The cubic root of 505431205 is about 796.5640162515.

The spelling of 505431205 in words is "five hundred five million, four hundred thirty-one thousand, two hundred five".