2116891 has 8 divisors (see below), whose sum is σ = 2561760. Its totient is φ = 1707648.

The previous prime is 2116867. The next prime is 2116901. The reversal of 2116891 is 1986112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2116891 - 2¹³ = 2108699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2116801) 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, 8776 + ... + 9013.

It is an arithmetic number, because the mean of its divisors is an integer number (320220).

2^2116891 is an apocalyptic number.

2116891 is a deficient number, since it is larger than the sum of its proper divisors (444869).

2116891 is a wasteful number, since it uses less digits than its factorization.

2116891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17813.

The product of its digits is 864, while the sum is 28.

The square root of 2116891 is about 1454.9539511613. The cubic root of 2116891 is about 128.4003375670.

The spelling of 2116891 in words is "two million, one hundred sixteen thousand, eight hundred ninety-one".