63981213 has 4 divisors (see below), whose sum is σ = 85308288. Its totient is φ = 42654140.

The previous prime is 63981199. The next prime is 63981233. The reversal of 63981213 is 31218936.

63981213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63981213 - 2²⁰ = 62932637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63981233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10663533 + ... + 10663538.

It is an arithmetic number, because the mean of its divisors is an integer number (21327072).

Almost surely, 2^63981213 is an apocalyptic number.

It is an amenable number.

63981213 is a deficient number, since it is larger than the sum of its proper divisors (21327075).

63981213 is a wasteful number, since it uses less digits than its factorization.

63981213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21327074.

The product of its digits is 7776, while the sum is 33.

The square root of 63981213 is about 7998.8257263176. The cubic root of 63981213 is about 399.9608565863.

The spelling of 63981213 in words is "sixty-three million, nine hundred eighty-one thousand, two hundred thirteen".