631513 has 2 divisors, whose sum is σ = 631514. Its totient is φ = 631512.

The previous prime is 631507. The next prime is 631529. The reversal of 631513 is 315136.

631513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444889 + 186624 = 667^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 631513 - 2¹³ = 623321 is a prime.

It is not a weakly prime, because it can be changed into another prime (631573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315756 + 315757.

It is an arithmetic number, because the mean of its divisors is an integer number (315757).

2⁶³¹⁵¹³ is an apocalyptic number.

It is an amenable number.

631513 is a deficient number, since it is larger than the sum of its proper divisors (1).

631513 is an equidigital number, since it uses as much as digits as its factorization.

631513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 19.

The square root of 631513 is about 794.6779221798. The cubic root of 631513 is about 85.7947602678.

Adding to 631513 its reverse (315136), we get a palindrome (946649).

It can be divided in two parts, 6315 and 13, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 631513 in words is "six hundred thirty-one thousand, five hundred thirteen".