638171 has 2 divisors, whose sum is σ = 638172. Its totient is φ = 638170.

The previous prime is 638161. The next prime is 638177. The reversal of 638171 is 171836.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638171 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638171.

It is not a weakly prime, because it can be changed into another prime (638177) 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 as a sum of consecutive naturals, namely, 319085 + 319086.

It is an arithmetic number, because the mean of its divisors is an integer number (319086).

2⁶³⁸¹⁷¹ is an apocalyptic number.

638171 is a deficient number, since it is larger than the sum of its proper divisors (1).

638171 is an equidigital number, since it uses as much as digits as its factorization.

638171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 638171 is about 798.8560571217. The cubic root of 638171 is about 86.0952163363.

The spelling of 638171 in words is "six hundred thirty-eight thousand, one hundred seventy-one".