531216313 has 2 divisors, whose sum is σ = 531216314. Its totient is φ = 531216312.

The previous prime is 531216299. The next prime is 531216319. The reversal of 531216313 is 313612135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 307055529 + 224160784 = 17523^2 + 14972^2 .

It is a cyclic number.

It is not a de Polignac number, because 531216313 - 2⁹ = 531215801 is a prime.

It is not a weakly prime, because it can be changed into another prime (531216319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265608156 + 265608157.

It is an arithmetic number, because the mean of its divisors is an integer number (265608157).

Almost surely, 2^531216313 is an apocalyptic number.

It is an amenable number.

531216313 is a deficient number, since it is larger than the sum of its proper divisors (1).

531216313 is an equidigital number, since it uses as much as digits as its factorization.

531216313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 25.

The square root of 531216313 is about 23048.1303580139. The cubic root of 531216313 is about 809.8858310865.

Adding to 531216313 its reverse (313612135), we get a palindrome (844828448).

The spelling of 531216313 in words is "five hundred thirty-one million, two hundred sixteen thousand, three hundred thirteen".