2173681887 has 12 divisors (see below), whose sum is σ = 3138334344. Its totient is φ = 1337650080.

The previous prime is 2173681859. The next prime is 2173681889. The reversal of 2173681887 is 7881863712.

2173681887 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 2173681887 - 2⁶ = 2173681823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173681889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2143164 + ... + 2144177.

It is an arithmetic number, because the mean of its divisors is an integer number (261527862).

Almost surely, 2^2173681887 is an apocalyptic number.

2173681887 is a deficient number, since it is larger than the sum of its proper divisors (964652457).

2173681887 is a wasteful number, since it uses less digits than its factorization.

2173681887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4287370 (or 4287357 counting only the distinct ones).

The product of its digits is 903168, while the sum is 51.

The square root of 2173681887 is about 46622.7614690507. The cubic root of 2173681887 is about 1295.3843985405.

The spelling of 2173681887 in words is "two billion, one hundred seventy-three million, six hundred eighty-one thousand, eight hundred eighty-seven".