2166001 has 8 divisors (see below), whose sum is σ = 2260224. Its totient is φ = 2073360.

The previous prime is 2165971. The next prime is 2166007. The reversal of 2166001 is 1006612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166001 - 2⁷ = 2165873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2991 + ... + 3643.

It is an arithmetic number, because the mean of its divisors is an integer number (282528).

2^2166001 is an apocalyptic number.

It is an amenable number.

2166001 is a deficient number, since it is larger than the sum of its proper divisors (94223).

2166001 is a wasteful number, since it uses less digits than its factorization.

2166001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2166001 is about 1471.7340112942. The cubic root of 2166001 is about 129.3856814755.

The spelling of 2166001 in words is "two million, one hundred sixty-six thousand, one".