2106161 has 4 divisors (see below), whose sum is σ = 2127972. Its totient is φ = 2084352.

The previous prime is 2106149. The next prime is 2106173. The reversal of 2106161 is 1616012.

2106161 = T₁₅₈ + T₁₅₉ + ... + T₂₅₄.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (2106149) and next prime (2106173).

It can be written as a sum of positive squares in 2 ways, for example, as 739600 + 1366561 = 860^2 + 1169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2106161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2106191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10760 + ... + 10953.

It is an arithmetic number, because the mean of its divisors is an integer number (531993).

2^2106161 is an apocalyptic number.

It is an amenable number.

2106161 is a deficient number, since it is larger than the sum of its proper divisors (21811).

2106161 is an equidigital number, since it uses as much as digits as its factorization.

2106161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21810.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2106161 is about 1451.2618647232. The cubic root of 2106161 is about 128.1830267402.

The spelling of 2106161 in words is "two million, one hundred six thousand, one hundred sixty-one".