505440231 has 4 divisors (see below), whose sum is σ = 673920312. Its totient is φ = 336960152.

The previous prime is 505440227. The next prime is 505440233. The reversal of 505440231 is 132044505.

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 505440231 - 2² = 505440227 is a prime.

It is a super-2 number, since 2×505440231² = 510939654226666722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505440233) 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, 84240036 + ... + 84240041.

It is an arithmetic number, because the mean of its divisors is an integer number (168480078).

Almost surely, 2^505440231 is an apocalyptic number.

505440231 is a deficient number, since it is larger than the sum of its proper divisors (168480081).

505440231 is a wasteful number, since it uses less digits than its factorization.

505440231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168480080.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 505440231 is about 22481.9979316786. The cubic root of 505440231 is about 796.5687579083.

Adding to 505440231 its reverse (132044505), we get a palindrome (637484736).

The spelling of 505440231 in words is "five hundred five million, four hundred forty thousand, two hundred thirty-one".