505431013 has 4 divisors (see below), whose sum is σ = 510641740. Its totient is φ = 500220288.

The previous prime is 505431007. The next prime is 505431041. The reversal of 505431013 is 310134505.

It is a happy number.

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 384826689 + 120604324 = 19617^2 + 10982^2 .

It is a cyclic number.

It is not a de Polignac number, because 505431013 - 2⁹ = 505430501 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 (505431413) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2605218 + ... + 2605411.

It is an arithmetic number, because the mean of its divisors is an integer number (127660435).

Almost surely, 2^505431013 is an apocalyptic number.

It is an amenable number.

505431013 is a deficient number, since it is larger than the sum of its proper divisors (5210727).

505431013 is an equidigital number, since it uses as much as digits as its factorization.

505431013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5210726.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 505431013 is about 22481.7929222738. The cubic root of 505431013 is about 796.5639153869.

Adding to 505431013 its reverse (310134505), we get a palindrome (815565518).

The spelling of 505431013 in words is "five hundred five million, four hundred thirty-one thousand, thirteen".