209045539 has 2 divisors, whose sum is σ = 209045540. Its totient is φ = 209045538.

The previous prime is 209045531. The next prime is 209045587. The reversal of 209045539 is 935540902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209045539 - 2³ = 209045531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209045498 and 209045507.

It is not a weakly prime, because it can be changed into another prime (209045531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104522769 + 104522770.

It is an arithmetic number, because the mean of its divisors is an integer number (104522770).

Almost surely, 2^209045539 is an apocalyptic number.

209045539 is a deficient number, since it is larger than the sum of its proper divisors (1).

209045539 is an equidigital number, since it uses as much as digits as its factorization.

209045539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 209045539 is about 14458.4072082647. The cubic root of 209045539 is about 593.4903129716.

The spelling of 209045539 in words is "two hundred nine million, forty-five thousand, five hundred thirty-nine".