505247231 has 2 divisors, whose sum is σ = 505247232. Its totient is φ = 505247230.

The previous prime is 505247209. The next prime is 505247257. The reversal of 505247231 is 132742505.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505247231 is a prime.

It is a super-2 number, since 2×505247231² = 510549528866334722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 505247194 and 505247203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505247261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252623615 + 252623616.

It is an arithmetic number, because the mean of its divisors is an integer number (252623616).

Almost surely, 2^505247231 is an apocalyptic number.

505247231 is a deficient number, since it is larger than the sum of its proper divisors (1).

505247231 is an equidigital number, since it uses as much as digits as its factorization.

505247231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 505247231 is about 22477.7051987075. The cubic root of 505247231 is about 796.4673563096.

Adding to 505247231 its reverse (132742505), we get a palindrome (637989736).

The spelling of 505247231 in words is "five hundred five million, two hundred forty-seven thousand, two hundred thirty-one".