2170161 has 48 divisors (see below), whose sum is σ = 3952000. Its totient is φ = 1143072.

The previous prime is 2170159. The next prime is 2170193. The reversal of 2170161 is 1610712.

It is not a de Polignac number, because 2170161 - 2¹ = 2170159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58635 + ... + 58671.

2^2170161 is an apocalyptic number.

2170161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2170161 is a deficient number, since it is larger than the sum of its proper divisors (1781839).

2170161 is a wasteful number, since it uses less digits than its factorization.

2170161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 2170161 is about 1473.1466322128. The cubic root of 2170161 is about 129.4684607878.

Adding to 2170161 its reverse (1610712), we get a palindrome (3780873).

The spelling of 2170161 in words is "two million, one hundred seventy thousand, one hundred sixty-one".