2118671 has 4 divisors (see below), whose sum is σ = 2230200. Its totient is φ = 2007144.

The previous prime is 2118667. The next prime is 2118689. The reversal of 2118671 is 1768112.

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 2118671 - 2² = 2118667 is a prime.

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 2118671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118601) 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, 55736 + ... + 55773.

It is an arithmetic number, because the mean of its divisors is an integer number (557550).

2^2118671 is an apocalyptic number.

2118671 is a deficient number, since it is larger than the sum of its proper divisors (111529).

2118671 is a wasteful number, since it uses less digits than its factorization.

2118671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111528.

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

The square root of 2118671 is about 1455.5655258352. The cubic root of 2118671 is about 128.4363162059.

The spelling of 2118671 in words is "two million, one hundred eighteen thousand, six hundred seventy-one".