2001684617 has 4 divisors (see below), whose sum is σ = 2003082900. Its totient is φ = 2000286336.

The previous prime is 2001684613. The next prime is 2001684623. The reversal of 2001684617 is 7164861002.

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 944394361 + 1057290256 = 30731^2 + 32516^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001684617 - 2² = 2001684613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001684613) 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, 696992 + ... + 699857.

It is an arithmetic number, because the mean of its divisors is an integer number (500770725).

Almost surely, 2^2001684617 is an apocalyptic number.

It is an amenable number.

2001684617 is a deficient number, since it is larger than the sum of its proper divisors (1398283).

2001684617 is a wasteful number, since it uses less digits than its factorization.

2001684617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398282.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 2001684617 is about 44740.1901761716. The cubic root of 2001684617 is about 1260.2746980231.

The spelling of 2001684617 in words is "two billion, one million, six hundred eighty-four thousand, six hundred seventeen".