644117271 has 16 divisors (see below), whose sum is σ = 1033171200. Its totient is φ = 348694848.

The previous prime is 644117269. The next prime is 644117273. The reversal of 644117271 is 172711446.

644117271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (644117269) and next prime (644117273).

It is not a de Polignac number, because 644117271 - 2¹ = 644117269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644117273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 806766 + ... + 807563.

It is an arithmetic number, because the mean of its divisors is an integer number (64573200).

Almost surely, 2^644117271 is an apocalyptic number.

644117271 is a deficient number, since it is larger than the sum of its proper divisors (389053929).

644117271 is a wasteful number, since it uses less digits than its factorization.

644117271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614358.

The product of its digits is 9408, while the sum is 33.

The square root of 644117271 is about 25379.4655381078. The cubic root of 644117271 is about 863.6179254692.

The spelling of 644117271 in words is "six hundred forty-four million, one hundred seventeen thousand, two hundred seventy-one".