63981005 has 16 divisors (see below), whose sum is σ = 84369600. Its totient is φ = 46191360.

The previous prime is 63980981. The next prime is 63981007. The reversal of 63981005 is 50018936.

63981005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63981005 - 2¹² = 63976909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63981007) 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 15 ways as a sum of consecutive naturals, for example, 3461 + ... + 11829.

It is an arithmetic number, because the mean of its divisors is an integer number (5273100).

Almost surely, 2^63981005 is an apocalyptic number.

It is an amenable number.

63981005 is a deficient number, since it is larger than the sum of its proper divisors (20388595).

63981005 is a wasteful number, since it uses less digits than its factorization.

63981005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8524.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 63981005 is about 7998.8127243985. The cubic root of 63981005 is about 399.9604231676.

The spelling of 63981005 in words is "sixty-three million, nine hundred eighty-one thousand, five".