2166217 has 4 divisors (see below), whose sum is σ = 2192400. Its totient is φ = 2140036.

The previous prime is 2166179. The next prime is 2166221. The reversal of 2166217 is 7126612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2166217 - 2¹⁹ = 1641929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2166191 and 2166200.

It is not an unprimeable number, because it can be changed into a prime (2166917) 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, 12967 + ... + 13132.

It is an arithmetic number, because the mean of its divisors is an integer number (548100).

2^2166217 is an apocalyptic number.

It is an amenable number.

2166217 is a deficient number, since it is larger than the sum of its proper divisors (26183).

2166217 is an equidigital number, since it uses as much as digits as its factorization.

2166217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26182.

The product of its digits is 1008, while the sum is 25.

The square root of 2166217 is about 1471.8073922902. The cubic root of 2166217 is about 129.3899822397.

The spelling of 2166217 in words is "two million, one hundred sixty-six thousand, two hundred seventeen".