531115217 has 2 divisors, whose sum is σ = 531115218. Its totient is φ = 531115216.

The previous prime is 531115213. The next prime is 531115237. The reversal of 531115217 is 712511135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 464790481 + 66324736 = 21559^2 + 8144^2 .

It is a cyclic number.

It is not a de Polignac number, because 531115217 - 2² = 531115213 is a prime.

It is not a weakly prime, because it can be changed into another prime (531115213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265557608 + 265557609.

It is an arithmetic number, because the mean of its divisors is an integer number (265557609).

Almost surely, 2^531115217 is an apocalyptic number.

It is an amenable number.

531115217 is a deficient number, since it is larger than the sum of its proper divisors (1).

531115217 is an equidigital number, since it uses as much as digits as its factorization.

531115217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1050, while the sum is 26.

The square root of 531115217 is about 23045.9371039669. The cubic root of 531115217 is about 809.8344512559.

The spelling of 531115217 in words is "five hundred thirty-one million, one hundred fifteen thousand, two hundred seventeen".