2005541 has 4 divisors (see below), whose sum is σ = 2123532. Its totient is φ = 1887552.

The previous prime is 2005519. The next prime is 2005547. The reversal of 2005541 is 1455002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1455002 = 2 ⋅727501.

It can be written as a sum of positive squares in 2 ways, for example, as 1833316 + 172225 = 1354^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005541 - 2¹⁸ = 1743397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 117973 = 2005541 / (2 + 0 + 0 + 5 + 5 + 4 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005547) 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 3 ways as a sum of consecutive naturals, for example, 58970 + ... + 59003.

It is an arithmetic number, because the mean of its divisors is an integer number (530883).

2^2005541 is an apocalyptic number.

It is an amenable number.

2005541 is a deficient number, since it is larger than the sum of its proper divisors (117991).

2005541 is a wasteful number, since it uses less digits than its factorization.

2005541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117990.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 2005541 is about 1416.1712467071. The cubic root of 2005541 is about 126.1083514109.

The spelling of 2005541 in words is "two million, five thousand, five hundred forty-one".