63931213 has 4 divisors (see below), whose sum is σ = 63957600. Its totient is φ = 63904828.

The previous prime is 63931193. The next prime is 63931229. The reversal of 63931213 is 31213936.

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 63931213 - 2⁹ = 63930701 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 (63931253) 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, 9145 + ... + 14542.

It is an arithmetic number, because the mean of its divisors is an integer number (15989400).

Almost surely, 2^63931213 is an apocalyptic number.

It is an amenable number.

63931213 is a deficient number, since it is larger than the sum of its proper divisors (26387).

63931213 is a wasteful number, since it uses less digits than its factorization.

63931213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26386.

The product of its digits is 2916, while the sum is 28.

The square root of 63931213 is about 7995.6996566905. The cubic root of 63931213 is about 399.8566423776.

The spelling of 63931213 in words is "sixty-three million, nine hundred thirty-one thousand, two hundred thirteen".