2157166 has 16 divisors (see below), whose sum is σ = 3644928. Its totient is φ = 948600.

The previous prime is 2157163. The next prime is 2157173. The reversal of 2157166 is 6617512.

2157166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157163) 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 7 ways as a sum of consecutive naturals, for example, 900 + ... + 2263.

It is an arithmetic number, because the mean of its divisors is an integer number (227808).

2^2157166 is an apocalyptic number.

2157166 is a deficient number, since it is larger than the sum of its proper divisors (1487762).

2157166 is a wasteful number, since it uses less digits than its factorization.

2157166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207.

The product of its digits is 2520, while the sum is 28.

The square root of 2157166 is about 1468.7293828340. The cubic root of 2157166 is about 129.2095226968.

It can be divided in two parts, 215 and 7166, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 2157166 in words is "two million, one hundred fifty-seven thousand, one hundred sixty-six".