2161006 has 8 divisors (see below), whose sum is σ = 3432240. Its totient is φ = 1016928.

The previous prime is 2161001. The next prime is 2161007. The reversal of 2161006 is 6001612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161001) 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, 31746 + ... + 31813.

It is an arithmetic number, because the mean of its divisors is an integer number (429030).

2^2161006 is an apocalyptic number.

2161006 is a deficient number, since it is larger than the sum of its proper divisors (1271234).

2161006 is a wasteful number, since it uses less digits than its factorization.

2161006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63578.

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

The square root of 2161006 is about 1470.0360539796. The cubic root of 2161006 is about 129.2861464474.

Adding to 2161006 its reverse (6001612), we get a palindrome (8162618).

Subtracting 2161006 from its reverse (6001612), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 2161006 in words is "two million, one hundred sixty-one thousand, six".