2161707 has 4 divisors (see below), whose sum is σ = 2882280. Its totient is φ = 1441136.

The previous prime is 2161699. The next prime is 2161729. The reversal of 2161707 is 7071612.

2161707 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.

It is a cyclic number.

It is not a de Polignac number, because 2161707 - 2³ = 2161699 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2161777) 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, 360282 + ... + 360287.

It is an arithmetic number, because the mean of its divisors is an integer number (720570).

2^2161707 is an apocalyptic number.

2161707 is a deficient number, since it is larger than the sum of its proper divisors (720573).

2161707 is an equidigital number, since it uses as much as digits as its factorization.

2161707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720572.

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 2161707 is about 1470.2744641733. The cubic root of 2161707 is about 129.3001244728.

The spelling of 2161707 in words is "two million, one hundred sixty-one thousand, seven hundred seven".