2117009 has 4 divisors (see below), whose sum is σ = 2119920. Its totient is φ = 2114100.

The previous prime is 2116997. The next prime is 2117039. The reversal of 2117009 is 9007112.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2117009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2117039) 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, 722 + ... + 2180.

It is an arithmetic number, because the mean of its divisors is an integer number (529980).

2^2117009 is an apocalyptic number.

It is an amenable number.

2117009 is a deficient number, since it is larger than the sum of its proper divisors (2911).

2117009 is a wasteful number, since it uses less digits than its factorization.

2117009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2910.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 2117009 is about 1454.9945017078. The cubic root of 2117009 is about 128.4027232918.

The spelling of 2117009 in words is "two million, one hundred seventeen thousand, nine".