2009545 has 4 divisors (see below), whose sum is σ = 2411460. Its totient is φ = 1607632.

The previous prime is 2009543. The next prime is 2009593. The reversal of 2009545 is 5459002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5459002 = 2 ⋅2729501.

It can be written as a sum of positive squares in 2 ways, for example, as 633616 + 1375929 = 796^2 + 1173^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009545 - 2¹ = 2009543 is a prime.

It is a super-2 number, since 2×2009545² = 8076542214050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2009543) 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, 200950 + ... + 200959.

It is an arithmetic number, because the mean of its divisors is an integer number (602865).

2^2009545 is an apocalyptic number.

It is an amenable number.

2009545 is a deficient number, since it is larger than the sum of its proper divisors (401915).

2009545 is an equidigital number, since it uses as much as digits as its factorization.

2009545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401914.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2009545 is about 1417.5842126660. The cubic root of 2009545 is about 126.1922194180.

The spelling of 2009545 in words is "two million, nine thousand, five hundred forty-five".