2161243 has 8 divisors (see below), whose sum is σ = 2520800. Its totient is φ = 1852200.

The previous prime is 2161213. The next prime is 2161253. The reversal of 2161243 is 3421612.

It is not a de Polignac number, because 2161243 - 2¹³ = 2153051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161243.

It is not an unprimeable number, because it can be changed into a prime (2161213) 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, 2808 + ... + 3493.

It is an arithmetic number, because the mean of its divisors is an integer number (315100).

2^2161243 is an apocalyptic number.

2161243 is a deficient number, since it is larger than the sum of its proper divisors (359557).

2161243 is an frugal number, since it uses more digits than its factorization.

2161243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6322 (or 6308 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 2161243 is about 1470.1166620374. The cubic root of 2161243 is about 129.2908725945.

Adding to 2161243 its reverse (3421612), we get a palindrome (5582855).

The spelling of 2161243 in words is "two million, one hundred sixty-one thousand, two hundred forty-three".