505423431 has 12 divisors (see below), whose sum is σ = 730470208. Its totient is φ = 336757824.

The previous prime is 505423417. The next prime is 505423433. The reversal of 505423431 is 134324505.

It is not a de Polignac number, because 505423431 - 2⁹ = 505422919 is a prime.

It is a super-2 number, since 2×505423431² = 510905689207623522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505423395 and 505423404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505423433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1866 + ... + 31848.

Almost surely, 2^505423431 is an apocalyptic number.

505423431 is a deficient number, since it is larger than the sum of its proper divisors (225046777).

505423431 is a wasteful number, since it uses less digits than its factorization.

505423431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31862 (or 31859 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 505423431 is about 22481.6242963003. The cubic root of 505423431 is about 796.5599322664.

Adding to 505423431 its reverse (134324505), we get a palindrome (639747936).

The spelling of 505423431 in words is "five hundred five million, four hundred twenty-three thousand, four hundred thirty-one".