1209139 has 2 divisors, whose sum is σ = 1209140. Its totient is φ = 1209138.

The previous prime is 1209121. The next prime is 1209151. The reversal of 1209139 is 9319021.

It is a strong prime.

It is an emirp because it is prime and its reverse (9319021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209139 - 2⁵ = 1209107 is a prime.

It is equal to p₉₃₅₅₃ and since 1209139 and 93553 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (1209199) 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 as a sum of consecutive naturals, namely, 604569 + 604570.

It is an arithmetic number, because the mean of its divisors is an integer number (604570).

2^1209139 is an apocalyptic number.

1209139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209139 is an equidigital number, since it uses as much as digits as its factorization.

1209139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1209139 is about 1099.6085667182. The cubic root of 1209139 is about 106.5349426510.

The spelling of 1209139 in words is "one million, two hundred nine thousand, one hundred thirty-nine".