505523431 has 4 divisors (see below), whose sum is σ = 577741072. Its totient is φ = 433305792.

The previous prime is 505523429. The next prime is 505523453. The reversal of 505523431 is 134325505.

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 505523431 - 2¹ = 505523429 is a prime.

It is a super-2 number, since 2×505523431² = 511107878580023522, which contains 22 as substring.

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 505523431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505523461) 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, 36108810 + ... + 36108823.

It is an arithmetic number, because the mean of its divisors is an integer number (144435268).

Almost surely, 2^505523431 is an apocalyptic number.

505523431 is a deficient number, since it is larger than the sum of its proper divisors (72217641).

505523431 is an equidigital number, since it uses as much as digits as its factorization.

505523431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72217640.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 505523431 is about 22483.8482248925. The cubic root of 505523431 is about 796.6124629668.

Adding to 505523431 its reverse (134325505), we get a palindrome (639848936).

The spelling of 505523431 in words is "five hundred five million, five hundred twenty-three thousand, four hundred thirty-one".