646113871 has 6 divisors (see below), whose sum is σ = 699638280. Its totient is φ = 596412648.

The previous prime is 646113863. The next prime is 646113899. The reversal of 646113871 is 178311646.

646113871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646113871 - 2³ = 646113863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646113871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646113851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1911411 + ... + 1911748.

It is an arithmetic number, because the mean of its divisors is an integer number (116606380).

Almost surely, 2^646113871 is an apocalyptic number.

646113871 is a deficient number, since it is larger than the sum of its proper divisors (53524409).

646113871 is a wasteful number, since it uses less digits than its factorization.

646113871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3823185 (or 3823172 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 646113871 is about 25418.7700528566. The cubic root of 646113871 is about 864.5093371521.

The spelling of 646113871 in words is "six hundred forty-six million, one hundred thirteen thousand, eight hundred seventy-one".