2116871 has 4 divisors (see below), whose sum is σ = 2168544. Its totient is φ = 2065200.

The previous prime is 2116867. The next prime is 2116901. The reversal of 2116871 is 1786112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2116871 - 2² = 2116867 is a prime.

It is a super-2 number, since 2×2116871² = 8962285661282, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2116871.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 25775 + ... + 25856.

It is an arithmetic number, because the mean of its divisors is an integer number (542136).

2^2116871 is an apocalyptic number.

2116871 is a deficient number, since it is larger than the sum of its proper divisors (51673).

2116871 is an equidigital number, since it uses as much as digits as its factorization.

2116871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51672.

The product of its digits is 672, while the sum is 26.

The square root of 2116871 is about 1454.9470780754. The cubic root of 2116871 is about 128.3999331981.

The spelling of 2116871 in words is "two million, one hundred sixteen thousand, eight hundred seventy-one".