531516247 has 2 divisors, whose sum is σ = 531516248. Its totient is φ = 531516246.

The previous prime is 531516233. The next prime is 531516257. The reversal of 531516247 is 742615135.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531516247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531516217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265758123 + 265758124.

It is an arithmetic number, because the mean of its divisors is an integer number (265758124).

Almost surely, 2^531516247 is an apocalyptic number.

531516247 is a deficient number, since it is larger than the sum of its proper divisors (1).

531516247 is an equidigital number, since it uses as much as digits as its factorization.

531516247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 531516247 is about 23054.6361281197. The cubic root of 531516247 is about 810.0382276324.

The spelling of 531516247 in words is "five hundred thirty-one million, five hundred sixteen thousand, two hundred forty-seven".