2181752161 has 8 divisors (see below), whose sum is σ = 2193040800. Its totient is φ = 2170478688.

The previous prime is 2181752143. The next prime is 2181752191. The reversal of 2181752161 is 1612571812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2181752161 - 2¹³ = 2181743969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181752191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382845 + ... + 388501.

It is an arithmetic number, because the mean of its divisors is an integer number (274130100).

Almost surely, 2^2181752161 is an apocalyptic number.

It is an amenable number.

2181752161 is a deficient number, since it is larger than the sum of its proper divisors (11288639).

2181752161 is a wasteful number, since it uses less digits than its factorization.

2181752161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7583.

The product of its digits is 6720, while the sum is 34.

The square root of 2181752161 is about 46709.2299337080. The cubic root of 2181752161 is about 1296.9855521694.

The spelling of 2181752161 in words is "two billion, one hundred eighty-one million, seven hundred fifty-two thousand, one hundred sixty-one".