2181752159 has 4 divisors (see below), whose sum is σ = 2296581240. Its totient is φ = 2066923080.

The previous prime is 2181752143. The next prime is 2181752191. The reversal of 2181752159 is 9512571812.

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 2181752159 - 2⁴ = 2181752143 is a prime.

It is a super-2 number, since 2×2181752159² = 9520084966602322562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181752059) 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, 57414512 + ... + 57414549.

It is an arithmetic number, because the mean of its divisors is an integer number (574145310).

Almost surely, 2^2181752159 is an apocalyptic number.

2181752159 is a deficient number, since it is larger than the sum of its proper divisors (114829081).

2181752159 is a wasteful number, since it uses less digits than its factorization.

2181752159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114829080.

The product of its digits is 50400, while the sum is 41.

The square root of 2181752159 is about 46709.2299122989. The cubic root of 2181752159 is about 1296.9855517730.

The spelling of 2181752159 in words is "two billion, one hundred eighty-one million, seven hundred fifty-two thousand, one hundred fifty-nine".