2161345 has 8 divisors (see below), whose sum is σ = 2730240. Its totient is φ = 1638000.

The previous prime is 2161343. The next prime is 2161349. The reversal of 2161345 is 5431612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2161345 - 2¹ = 2161343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2161343) 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, 11281 + ... + 11470.

It is an arithmetic number, because the mean of its divisors is an integer number (341280).

2^2161345 is an apocalyptic number.

It is an amenable number.

2161345 is a deficient number, since it is larger than the sum of its proper divisors (568895).

2161345 is a wasteful number, since it uses less digits than its factorization.

2161345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22775.

The product of its digits is 720, while the sum is 22.

The square root of 2161345 is about 1470.1513527525. The cubic root of 2161345 is about 129.2929065261.

Adding to 2161345 its reverse (5431612), we get a palindrome (7592957).

The spelling of 2161345 in words is "two million, one hundred sixty-one thousand, three hundred forty-five".