505423131 has 4 divisors (see below), whose sum is σ = 673897512. Its totient is φ = 336948752.

The previous prime is 505423117. The next prime is 505423153. The reversal of 505423131 is 131324505.

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

It is a cyclic number.

It is not a de Polignac number, because 505423131 - 2¹⁰ = 505422107 is a prime.

It is a super-2 number, since 2×505423131² = 510905082699686322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (505421131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84237186 + ... + 84237191.

It is an arithmetic number, because the mean of its divisors is an integer number (168474378).

Almost surely, 2^505423131 is an apocalyptic number.

505423131 is a deficient number, since it is larger than the sum of its proper divisors (168474381).

505423131 is a wasteful number, since it uses less digits than its factorization.

505423131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168474380.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 505423131 is about 22481.6176241835. The cubic root of 505423131 is about 796.5597746639.

Adding to 505423131 its reverse (131324505), we get a palindrome (636747636).

The spelling of 505423131 in words is "five hundred five million, four hundred twenty-three thousand, one hundred thirty-one".