2161173445 has 4 divisors (see below), whose sum is σ = 2593408140. Its totient is φ = 1728938752.

The previous prime is 2161173419. The next prime is 2161173451. The reversal of 2161173445 is 5443711612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1190664036 + 970509409 = 34506^2 + 31153^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161173445 - 2⁹ = 2161172933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2161173445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216117340 + ... + 216117349.

It is an arithmetic number, because the mean of its divisors is an integer number (648352035).

Almost surely, 2^2161173445 is an apocalyptic number.

It is an amenable number.

2161173445 is a deficient number, since it is larger than the sum of its proper divisors (432234695).

2161173445 is an equidigital number, since it uses as much as digits as its factorization.

2161173445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432234694.

The product of its digits is 20160, while the sum is 34.

The square root of 2161173445 is about 46488.4226985601. The cubic root of 2161173445 is about 1292.8948559584.

The spelling of 2161173445 in words is "two billion, one hundred sixty-one million, one hundred seventy-three thousand, four hundred forty-five".