2161973 has 4 divisors (see below), whose sum is σ = 2358528. Its totient is φ = 1965420.

The previous prime is 2161967. The next prime is 2161987. The reversal of 2161973 is 3791612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161903) 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, 98261 + ... + 98282.

It is an arithmetic number, because the mean of its divisors is an integer number (589632).

2^2161973 is an apocalyptic number.

It is an amenable number.

2161973 is a deficient number, since it is larger than the sum of its proper divisors (196555).

2161973 is a wasteful number, since it uses less digits than its factorization.

2161973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196554.

The product of its digits is 2268, while the sum is 29.

The square root of 2161973 is about 1470.3649206915. The cubic root of 2161973 is about 129.3054277544.

The spelling of 2161973 in words is "two million, one hundred sixty-one thousand, nine hundred seventy-three".