639167 has 2 divisors, whose sum is σ = 639168. Its totient is φ = 639166.

The previous prime is 639157. The next prime is 639169. The reversal of 639167 is 761936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639167 - 2⁴ = 639151 is a prime.

Together with 639169, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319583 + 319584.

It is an arithmetic number, because the mean of its divisors is an integer number (319584).

2⁶³⁹¹⁶⁷ is an apocalyptic number.

639167 is a deficient number, since it is larger than the sum of its proper divisors (1).

639167 is an equidigital number, since it uses as much as digits as its factorization.

639167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 32.

The square root of 639167 is about 799.4792054832. The cubic root of 639167 is about 86.1399829497.

The spelling of 639167 in words is "six hundred thirty-nine thousand, one hundred sixty-seven".