505143421 has 4 divisors (see below), whose sum is σ = 505654144. Its totient is φ = 504632700.

The previous prime is 505143413. The next prime is 505143433. The reversal of 505143421 is 124341505.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505143421 - 2³ = 505143413 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 (505143461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253875 + ... + 255856.

It is an arithmetic number, because the mean of its divisors is an integer number (126413536).

Almost surely, 2^505143421 is an apocalyptic number.

It is an amenable number.

505143421 is a deficient number, since it is larger than the sum of its proper divisors (510723).

505143421 is an equidigital number, since it uses as much as digits as its factorization.

505143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510722.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 505143421 is about 22475.3959030759. The cubic root of 505143421 is about 796.4128041785.

Adding to 505143421 its reverse (124341505), we get a palindrome (629484926).

It can be divided in two parts, 50514 and 3421, that added together give a palindrome (53935).

The spelling of 505143421 in words is "five hundred five million, one hundred forty-three thousand, four hundred twenty-one".