2045509 has 2 divisors, whose sum is σ = 2045510. Its totient is φ = 2045508.

The previous prime is 2045503. The next prime is 2045539. The reversal of 2045509 is 9055402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2030625 + 14884 = 1425^2 + 122^2 .

It is a cyclic number.

It is not a de Polignac number, because 2045509 - 2¹⁵ = 2012741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2045503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1022754 + 1022755.

It is an arithmetic number, because the mean of its divisors is an integer number (1022755).

2^2045509 is an apocalyptic number.

It is an amenable number.

2045509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2045509 is an equidigital number, since it uses as much as digits as its factorization.

2045509 is an evil number, because the sum of its binary digits is even.

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

The square root of 2045509 is about 1430.2129212114. The cubic root of 2045509 is about 126.9405760808.

The spelling of 2045509 in words is "two million, forty-five thousand, five hundred nine".