2161289 has 12 divisors (see below), whose sum is σ = 2418948. Its totient is φ = 1919520.

The previous prime is 2161279. The next prime is 2161297. The reversal of 2161289 is 9821612.

It can be written as a sum of positive squares in 2 ways, for example, as 1177225 + 984064 = 1085^2 + 992^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2161289 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12407 + ... + 12579.

It is an arithmetic number, because the mean of its divisors is an integer number (201579).

2^2161289 is an apocalyptic number.

It is an amenable number.

2161289 is a deficient number, since it is larger than the sum of its proper divisors (257659).

2161289 is a wasteful number, since it uses less digits than its factorization.

2161289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 217 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 2161289 is about 1470.1323069710. The cubic root of 2161289 is about 129.2917898657.

The spelling of 2161289 in words is "two million, one hundred sixty-one thousand, two hundred eighty-nine".