2105161 has 4 divisors (see below), whose sum is σ = 2229012. Its totient is φ = 1981312.

The previous prime is 2105149. The next prime is 2105183. The reversal of 2105161 is 1615012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1115136 + 990025 = 1056^2 + 995^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105161 - 2¹⁵ = 2072393 is a prime.

It is a Duffinian number.

2105161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2105111) 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, 61900 + ... + 61933.

It is an arithmetic number, because the mean of its divisors is an integer number (557253).

2^2105161 is an apocalyptic number.

It is an amenable number.

2105161 is a deficient number, since it is larger than the sum of its proper divisors (123851).

2105161 is a wasteful number, since it uses less digits than its factorization.

2105161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123850.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 2105161 is about 1450.9172960579. The cubic root of 2105161 is about 128.1627365346.

It can be divided in two parts, 21051 and 61, that added together give a palindrome (21112).

The spelling of 2105161 in words is "two million, one hundred five thousand, one hundred sixty-one".