643574171 has 4 divisors (see below), whose sum is σ = 659271144. Its totient is φ = 627877200.

The previous prime is 643574153. The next prime is 643574227. The reversal of 643574171 is 171475346.

643574171 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 643574171 - 2¹⁴ = 643557787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643574111) 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, 7848425 + ... + 7848506.

It is an arithmetic number, because the mean of its divisors is an integer number (164817786).

Almost surely, 2^643574171 is an apocalyptic number.

643574171 is a deficient number, since it is larger than the sum of its proper divisors (15696973).

643574171 is a wasteful number, since it uses less digits than its factorization.

643574171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15696972.

The product of its digits is 70560, while the sum is 38.

The square root of 643574171 is about 25368.7636868650. The cubic root of 643574171 is about 863.3751318029.

The spelling of 643574171 in words is "six hundred forty-three million, five hundred seventy-four thousand, one hundred seventy-one".