1209539 has 2 divisors, whose sum is σ = 1209540. Its totient is φ = 1209538.

The previous prime is 1209517. The next prime is 1209557. The reversal of 1209539 is 9359021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1209539 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1209139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604769 + 604770.

It is an arithmetic number, because the mean of its divisors is an integer number (604770).

2^1209539 is an apocalyptic number.

1209539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209539 is an equidigital number, since it uses as much as digits as its factorization.

1209539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 1209539 is about 1099.7904345829. The cubic root of 1209539 is about 106.5466891028.

The spelling of 1209539 in words is "one million, two hundred nine thousand, five hundred thirty-nine".