2191017 has 4 divisors (see below), whose sum is σ = 2921360. Its totient is φ = 1460676.

The previous prime is 2191001. The next prime is 2191019. The reversal of 2191017 is 7101912.

2191017 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2191017 - 2⁴ = 2191001 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2190984 and 2191002.

It is not an unprimeable number, because it can be changed into a prime (2191019) 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, 365167 + ... + 365172.

It is an arithmetic number, because the mean of its divisors is an integer number (730340).

2^2191017 is an apocalyptic number.

It is an amenable number.

2191017 is a deficient number, since it is larger than the sum of its proper divisors (730343).

2191017 is an equidigital number, since it uses as much as digits as its factorization.

2191017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730342.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 2191017 is about 1480.2084312691. The cubic root of 2191017 is about 129.8818848261.

Adding to 2191017 its reverse (7101912), we get a palindrome (9292929).

The spelling of 2191017 in words is "two million, one hundred ninety-one thousand, seventeen".