635231213 has 2 divisors, whose sum is σ = 635231214. Its totient is φ = 635231212.

The previous prime is 635231209. The next prime is 635231239. The reversal of 635231213 is 312132536.

It is an a-pointer prime, because the next prime (635231239) can be obtained adding 635231213 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627903364 + 7327849 = 25058^2 + 2707^2 .

It is a cyclic number.

It is not a de Polignac number, because 635231213 - 2² = 635231209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (635231243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317615606 + 317615607.

It is an arithmetic number, because the mean of its divisors is an integer number (317615607).

Almost surely, 2^635231213 is an apocalyptic number.

It is an amenable number.

635231213 is a deficient number, since it is larger than the sum of its proper divisors (1).

635231213 is an equidigital number, since it uses as much as digits as its factorization.

635231213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 26.

The square root of 635231213 is about 25203.7936231830. The cubic root of 635231213 is about 859.6281126000.

Adding to 635231213 its reverse (312132536), we get a palindrome (947363749).

The spelling of 635231213 in words is "six hundred thirty-five million, two hundred thirty-one thousand, two hundred thirteen".