2117959 has 4 divisors (see below), whose sum is σ = 2136816. Its totient is φ = 2099104.

The previous prime is 2117953. The next prime is 2117971. The reversal of 2117959 is 9597112.

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 2117959 - 2⁹ = 2117447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117953) 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, 9259 + ... + 9484.

It is an arithmetic number, because the mean of its divisors is an integer number (534204).

2^2117959 is an apocalyptic number.

2117959 is a deficient number, since it is larger than the sum of its proper divisors (18857).

2117959 is a wasteful number, since it uses less digits than its factorization.

2117959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18856.

The product of its digits is 5670, while the sum is 34.

The square root of 2117959 is about 1455.3209268062. The cubic root of 2117959 is about 128.4219271695.

The spelling of 2117959 in words is "two million, one hundred seventeen thousand, nine hundred fifty-nine".