2108917 has 4 divisors (see below), whose sum is σ = 2160396. Its totient is φ = 2057440.

The previous prime is 2108881. The next prime is 2108927. The reversal of 2108917 is 7198012.

2108917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1110916 + 998001 = 1054^2 + 999^2 .

It is a cyclic number.

It is not a de Polignac number, because 2108917 - 2¹⁹ = 1584629 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25678 + ... + 25759.

It is an arithmetic number, because the mean of its divisors is an integer number (540099).

2^2108917 is an apocalyptic number.

It is an amenable number.

2108917 is a deficient number, since it is larger than the sum of its proper divisors (51479).

2108917 is an equidigital number, since it uses as much as digits as its factorization.

2108917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51478.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2108917 is about 1452.2110728128. The cubic root of 2108917 is about 128.2389133261.

It can be divided in two parts, 2108 and 917, that added together give a square (3025 = 55²).

The spelling of 2108917 in words is "two million, one hundred eight thousand, nine hundred seventeen".