639163 has 4 divisors (see below), whose sum is σ = 730480. Its totient is φ = 547848.

The previous prime is 639157. The next prime is 639167. The reversal of 639163 is 361936.

639163 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.

It is not a de Polignac number, because 639163 - 2¹⁷ = 508091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639167) 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, 45648 + ... + 45661.

It is an arithmetic number, because the mean of its divisors is an integer number (182620).

2⁶³⁹¹⁶³ is an apocalyptic number.

639163 is a deficient number, since it is larger than the sum of its proper divisors (91317).

639163 is an equidigital number, since it uses as much as digits as its factorization.

639163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91316.

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

The square root of 639163 is about 799.4767038507. The cubic root of 639163 is about 86.1398032572.

The spelling of 639163 in words is "six hundred thirty-nine thousand, one hundred sixty-three".