63973813 has 2 divisors, whose sum is σ = 63973814. Its totient is φ = 63973812.

The previous prime is 63973807. The next prime is 63973829. The reversal of 63973813 is 31837936.

63973813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61355889 + 2617924 = 7833^2 + 1618^2 .

It is a cyclic number.

It is not a de Polignac number, because 63973813 - 2¹³ = 63965621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63973853) 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 as a sum of consecutive naturals, namely, 31986906 + 31986907.

It is an arithmetic number, because the mean of its divisors is an integer number (31986907).

Almost surely, 2^63973813 is an apocalyptic number.

It is an amenable number.

63973813 is a deficient number, since it is larger than the sum of its proper divisors (1).

63973813 is an equidigital number, since it uses as much as digits as its factorization.

63973813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 63973813 is about 7998.3631450441. The cubic root of 63973813 is about 399.9454363073.

The spelling of 63973813 in words is "sixty-three million, nine hundred seventy-three thousand, eight hundred thirteen".