2161710973 has 4 divisors (see below), whose sum is σ = 2288870460. Its totient is φ = 2034551488.

The previous prime is 2161710917. The next prime is 2161711001. The reversal of 2161710973 is 3790171612.

2161710973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1299818809 + 861892164 = 36053^2 + 29358^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161710973 - 2⁹ = 2161710461 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 (2161713973) 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, 63579718 + ... + 63579751.

It is an arithmetic number, because the mean of its divisors is an integer number (572217615).

Almost surely, 2^2161710973 is an apocalyptic number.

It is an amenable number.

2161710973 is a deficient number, since it is larger than the sum of its proper divisors (127159487).

2161710973 is a wasteful number, since it uses less digits than its factorization.

2161710973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127159486.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 2161710973 is about 46494.2036494873. The cubic root of 2161710973 is about 1293.0020368634.

The spelling of 2161710973 in words is "two billion, one hundred sixty-one million, seven hundred ten thousand, nine hundred seventy-three".