505105423 has 4 divisors (see below), whose sum is σ = 514635768. Its totient is φ = 495575080.

The previous prime is 505105399. The next prime is 505105427. The reversal of 505105423 is 324501505.

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 505105423 - 2²¹ = 503008271 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 (505105427) 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, 4765093 + ... + 4765198.

It is an arithmetic number, because the mean of its divisors is an integer number (128658942).

Almost surely, 2^505105423 is an apocalyptic number.

505105423 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

505105423 is a deficient number, since it is larger than the sum of its proper divisors (9530345).

505105423 is an equidigital number, since it uses as much as digits as its factorization.

505105423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9530344.

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

The square root of 505105423 is about 22474.5505628033. The cubic root of 505105423 is about 796.3928343697.

Adding to 505105423 its reverse (324501505), we get a palindrome (829606928).

The spelling of 505105423 in words is "five hundred five million, one hundred five thousand, four hundred twenty-three".