2197009 has 4 divisors (see below), whose sum is σ = 2238516. Its totient is φ = 2155504.

The previous prime is 2196979. The next prime is 2197021. The reversal of 2197009 is 9007912.

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 804609 + 1392400 = 897^2 + 1180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2197009 - 2⁵ = 2196977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2197049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20674 + ... + 20779.

It is an arithmetic number, because the mean of its divisors is an integer number (559629).

2^2197009 is an apocalyptic number.

It is an amenable number.

2197009 is a deficient number, since it is larger than the sum of its proper divisors (41507).

2197009 is an equidigital number, since it uses as much as digits as its factorization.

2197009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41506.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 2197009 is about 1482.2310885958. The cubic root of 2197009 is about 130.0001775146. Note that the first 3 decimals are identical.

The spelling of 2197009 in words is "two million, one hundred ninety-seven thousand, nine".