2161317 has 4 divisors (see below), whose sum is σ = 2881760. Its totient is φ = 1440876.

The previous prime is 2161303. The next prime is 2161319. The reversal of 2161317 is 7131612.

2161317 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2161317 - 2⁴ = 2161301 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2161293 and 2161302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360217 + ... + 360222.

It is an arithmetic number, because the mean of its divisors is an integer number (720440).

2^2161317 is an apocalyptic number.

It is an amenable number.

2161317 is a deficient number, since it is larger than the sum of its proper divisors (720443).

2161317 is an equidigital number, since it uses as much as digits as its factorization.

2161317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720442.

The product of its digits is 252, while the sum is 21.

The square root of 2161317 is about 1470.1418298926. The cubic root of 2161317 is about 129.2923481983.

Adding to 2161317 its reverse (7131612), we get a palindrome (9292929).

The spelling of 2161317 in words is "two million, one hundred sixty-one thousand, three hundred seventeen".