631543613 has 2 divisors, whose sum is σ = 631543614. Its totient is φ = 631543612.

The previous prime is 631543589. The next prime is 631543621. The reversal of 631543613 is 316345136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418325209 + 213218404 = 20453^2 + 14602^2 .

It is a cyclic number.

It is not a de Polignac number, because 631543613 - 2²² = 627349309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631543613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631543673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315771806 + 315771807.

It is an arithmetic number, because the mean of its divisors is an integer number (315771807).

Almost surely, 2^631543613 is an apocalyptic number.

It is an amenable number.

631543613 is a deficient number, since it is larger than the sum of its proper divisors (1).

631543613 is an equidigital number, since it uses as much as digits as its factorization.

631543613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 32.

The square root of 631543613 is about 25130.5314905992. The cubic root of 631543613 is about 857.9614656417.

Adding to 631543613 its reverse (316345136), we get a palindrome (947888749).

The spelling of 631543613 in words is "six hundred thirty-one million, five hundred forty-three thousand, six hundred thirteen".