2105545 has 16 divisors (see below), whose sum is σ = 2817360. Its totient is φ = 1499904.

The previous prime is 2105513. The next prime is 2105549. The reversal of 2105545 is 5455012.

2105545 = 41² + 42² + ... + 185².

It can be written as a sum of positive squares in 8 ways, for example, as 558009 + 1547536 = 747^2 + 1244^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105545 - 2⁵ = 2105513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2105549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1327 + ... + 2443.

It is an arithmetic number, because the mean of its divisors is an integer number (176085).

2^2105545 is an apocalyptic number.

It is an amenable number.

2105545 is a deficient number, since it is larger than the sum of its proper divisors (711815).

2105545 is a wasteful number, since it uses less digits than its factorization.

2105545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 2105545 is about 1451.0496201026. The cubic root of 2105545 is about 128.1705287334.

The spelling of 2105545 in words is "two million, one hundred five thousand, five hundred forty-five".