2161323 has 10 divisors (see below), whose sum is σ = 3228764. Its totient is φ = 1440828.

The previous prime is 2161319. The next prime is 2161331. The reversal of 2161323 is 3231612.

It is not a de Polignac number, because 2161323 - 2² = 2161319 is a prime.

It is a super-2 number, since 2×2161323² = 9342634220658, which contains 22 as substring.

It is a Duffinian number.

2161323 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2161296 and 2161305.

It is not an unprimeable number, because it can be changed into a prime (2161303) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13261 + ... + 13422.

2^2161323 is an apocalyptic number.

2161323 is a deficient number, since it is larger than the sum of its proper divisors (1067441).

2161323 is an equidigital number, since it uses as much as digits as its factorization.

2161323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26695 (or 26686 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 2161323 is about 1470.1438705106. The cubic root of 2161323 is about 129.2924678404.

Adding to 2161323 its reverse (3231612), we get a palindrome (5392935).

The spelling of 2161323 in words is "two million, one hundred sixty-one thousand, three hundred twenty-three".