634543213 has 2 divisors, whose sum is σ = 634543214. Its totient is φ = 634543212.

The previous prime is 634543187. The next prime is 634543243. The reversal of 634543213 is 312345436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 568965609 + 65577604 = 23853^2 + 8098^2 .

It is a cyclic number.

It is not a de Polignac number, because 634543213 - 2²⁹ = 97672301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634543243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317271606 + 317271607.

It is an arithmetic number, because the mean of its divisors is an integer number (317271607).

Almost surely, 2^634543213 is an apocalyptic number.

It is an amenable number.

634543213 is a deficient number, since it is larger than the sum of its proper divisors (1).

634543213 is an equidigital number, since it uses as much as digits as its factorization.

634543213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 31.

The square root of 634543213 is about 25190.1411865833. The cubic root of 634543213 is about 859.3176546250.

Adding to 634543213 its reverse (312345436), we get a palindrome (946888649).

The spelling of 634543213 in words is "six hundred thirty-four million, five hundred forty-three thousand, two hundred thirteen".