531115213 has 2 divisors, whose sum is σ = 531115214. Its totient is φ = 531115212.

The previous prime is 531115201. The next prime is 531115217. The reversal of 531115213 is 312511135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388957284 + 142157929 = 19722^2 + 11923^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531115213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531115217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265557606 + 265557607.

It is an arithmetic number, because the mean of its divisors is an integer number (265557607).

Almost surely, 2^531115213 is an apocalyptic number.

It is an amenable number.

531115213 is a deficient number, since it is larger than the sum of its proper divisors (1).

531115213 is an equidigital number, since it uses as much as digits as its factorization.

531115213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 22.

The square root of 531115213 is about 23045.9370171837. The cubic root of 531115213 is about 809.8344492229.

Adding to 531115213 its reverse (312511135), we get a palindrome (843626348).

The spelling of 531115213 in words is "five hundred thirty-one million, one hundred fifteen thousand, two hundred thirteen".