531631613 has 2 divisors, whose sum is σ = 531631614. Its totient is φ = 531631612.

The previous prime is 531631603. The next prime is 531631649. The reversal of 531631613 is 316136135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 474281284 + 57350329 = 21778^2 + 7573^2 .

It is a cyclic number.

It is not a de Polignac number, because 531631613 - 2⁶ = 531631549 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531631603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265815806 + 265815807.

It is an arithmetic number, because the mean of its divisors is an integer number (265815807).

Almost surely, 2^531631613 is an apocalyptic number.

It is an amenable number.

531631613 is a deficient number, since it is larger than the sum of its proper divisors (1).

531631613 is an equidigital number, since it uses as much as digits as its factorization.

531631613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 29.

The square root of 531631613 is about 23057.1380053987. The cubic root of 531631613 is about 810.0968298610.

Adding to 531631613 its reverse (316136135), we get a palindrome (847767748).

The spelling of 531631613 in words is "five hundred thirty-one million, six hundred thirty-one thousand, six hundred thirteen".