63631213 has 2 divisors, whose sum is σ = 63631214. Its totient is φ = 63631212.

The previous prime is 63631207. The next prime is 63631259. The reversal of 63631213 is 31213636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63011844 + 619369 = 7938^2 + 787^2 .

It is a cyclic number.

It is not a de Polignac number, because 63631213 - 2¹⁷ = 63500141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63631283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31815606 + 31815607.

It is an arithmetic number, because the mean of its divisors is an integer number (31815607).

Almost surely, 2^63631213 is an apocalyptic number.

It is an amenable number.

63631213 is a deficient number, since it is larger than the sum of its proper divisors (1).

63631213 is an equidigital number, since it uses as much as digits as its factorization.

63631213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 25.

The square root of 63631213 is about 7976.9175124230. The cubic root of 63631213 is about 399.2302132713.

Adding to 63631213 its reverse (31213636), we get a palindrome (94844849).

The spelling of 63631213 in words is "sixty-three million, six hundred thirty-one thousand, two hundred thirteen".