63993913 has 4 divisors (see below), whose sum is σ = 64765008. Its totient is φ = 63222820.

The previous prime is 63993883. The next prime is 63993929. The reversal of 63993913 is 31939936.

63993913 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 63993913 - 2¹³ = 63985721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63993913.

It is not an unprimeable number, because it can be changed into a prime (63993953) 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, 385423 + ... + 385588.

It is an arithmetic number, because the mean of its divisors is an integer number (16191252).

Almost surely, 2^63993913 is an apocalyptic number.

It is an amenable number.

63993913 is a deficient number, since it is larger than the sum of its proper divisors (771095).

63993913 is an equidigital number, since it uses as much as digits as its factorization.

63993913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771094.

The product of its digits is 118098, while the sum is 43.

The square root of 63993913 is about 7999.6195534538. The cubic root of 63993913 is about 399.9873183479.

The spelling of 63993913 in words is "sixty-three million, nine hundred ninety-three thousand, nine hundred thirteen".