63506213 has 4 divisors (see below), whose sum is σ = 63969900. Its totient is φ = 63042528.

The previous prime is 63506207. The next prime is 63506249. The reversal of 63506213 is 31260536.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38725729 + 24780484 = 6223^2 + 4978^2 .

It is a cyclic number.

It is not a de Polignac number, because 63506213 - 2⁸ = 63505957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63506293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231638 + ... + 231911.

It is an arithmetic number, because the mean of its divisors is an integer number (15992475).

Almost surely, 2^63506213 is an apocalyptic number.

It is an amenable number.

63506213 is a deficient number, since it is larger than the sum of its proper divisors (463687).

63506213 is a wasteful number, since it uses less digits than its factorization.

63506213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463686.

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

The square root of 63506213 is about 7969.0785540111. The cubic root of 63506213 is about 398.9686200073.

Adding to 63506213 its reverse (31260536), we get a palindrome (94766749).

The spelling of 63506213 in words is "sixty-three million, five hundred six thousand, two hundred thirteen".