638041171 has 4 divisors (see below), whose sum is σ = 639295200. Its totient is φ = 636787144.

The previous prime is 638041141. The next prime is 638041177. The reversal of 638041171 is 171140836.

638041171 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 a cyclic number.

It is not a de Polignac number, because 638041171 - 2⁷ = 638041043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638041177) 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, 626251 + ... + 627268.

It is an arithmetic number, because the mean of its divisors is an integer number (159823800).

Almost surely, 2^638041171 is an apocalyptic number.

638041171 is a deficient number, since it is larger than the sum of its proper divisors (1254029).

638041171 is a wasteful number, since it uses less digits than its factorization.

638041171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254028.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 638041171 is about 25259.4768552320. The cubic root of 638041171 is about 860.8937755959.

The spelling of 638041171 in words is "six hundred thirty-eight million, forty-one thousand, one hundred seventy-one".