2161518 has 16 divisors (see below), whose sum is σ = 4339920. Its totient is φ = 717696.

The previous prime is 2161513. The next prime is 2161553. The reversal of 2161518 is 8151612.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1488 + ... + 2556.

It is an arithmetic number, because the mean of its divisors is an integer number (271245).

2^2161518 is an apocalyptic number.

2161518 is an abundant number, since it is smaller than the sum of its proper divisors (2178402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161518 is a wasteful number, since it uses less digits than its factorization.

2161518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411.

The product of its digits is 480, while the sum is 24.

The square root of 2161518 is about 1470.2101890546. The cubic root of 2161518 is about 129.2963560874.

The spelling of 2161518 in words is "two million, one hundred sixty-one thousand, five hundred eighteen".