63138643 has 4 divisors (see below), whose sum is σ = 63154728. Its totient is φ = 63122560.

The previous prime is 63138631. The next prime is 63138671. The reversal of 63138643 is 34683136.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63138643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63138599 and 63138608.

It is not an unprimeable number, because it can be changed into a prime (63138683) 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, 2163 + ... + 11443.

It is an arithmetic number, because the mean of its divisors is an integer number (15788682).

Almost surely, 2^63138643 is an apocalyptic number.

63138643 is a deficient number, since it is larger than the sum of its proper divisors (16085).

63138643 is an equidigital number, since it uses as much as digits as its factorization.

63138643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16084.

The product of its digits is 31104, while the sum is 34.

The square root of 63138643 is about 7945.9828215269. The cubic root of 63138643 is about 398.1973949908.

The spelling of 63138643 in words is "sixty-three million, one hundred thirty-eight thousand, six hundred forty-three".