2181271959 has 6 divisors (see below), whose sum is σ = 3150726176. Its totient is φ = 1454181300.

The previous prime is 2181271957. The next prime is 2181271969. The reversal of 2181271959 is 9591721812.

It is not a de Polignac number, because 2181271959 - 2¹ = 2181271957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181271957) 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, 121181767 + ... + 121181784.

Almost surely, 2^2181271959 is an apocalyptic number.

2181271959 is a deficient number, since it is larger than the sum of its proper divisors (969454217).

2181271959 is a wasteful number, since it uses less digits than its factorization.

2181271959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242363557 (or 242363554 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The square root of 2181271959 is about 46704.0893177460. The cubic root of 2181271959 is about 1296.8903900077.

The spelling of 2181271959 in words is "two billion, one hundred eighty-one million, two hundred seventy-one thousand, nine hundred fifty-nine".