2001217 has 4 divisors (see below), whose sum is σ = 2011780. Its totient is φ = 1990656.

The previous prime is 2001211. The next prime is 2001229. The reversal of 2001217 is 7121002.

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 269361 + 1731856 = 519^2 + 1316^2 .

It is a 5-Lehmer number, since φ(2001217) divides (2001217-1)⁵.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001197 and 2001206.

It is not an unprimeable number, because it can be changed into a prime (2001211) 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, 4992 + ... + 5377.

It is an arithmetic number, because the mean of its divisors is an integer number (502945).

2^2001217 is an apocalyptic number.

It is an amenable number.

2001217 is a deficient number, since it is larger than the sum of its proper divisors (10563).

2001217 is a wasteful number, since it uses less digits than its factorization.

2001217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10562.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 2001217 is about 1414.6437714138. The cubic root of 2001217 is about 126.0176552064.

Adding to 2001217 its reverse (7121002), we get a palindrome (9122219).

The spelling of 2001217 in words is "two million, one thousand, two hundred seventeen".