1004109209 has 2 divisors, whose sum is σ = 1004109210. Its totient is φ = 1004109208.

The previous prime is 1004109203. The next prime is 1004109241. The reversal of 1004109209 is 9029014001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529000000 + 475109209 = 23000^2 + 21797^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004109209 - 2¹⁶ = 1004043673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1004109203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502054604 + 502054605.

It is an arithmetic number, because the mean of its divisors is an integer number (502054605).

Almost surely, 2^1004109209 is an apocalyptic number.

It is an amenable number.

1004109209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004109209 is an equidigital number, since it uses as much as digits as its factorization.

1004109209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1004109209 is about 31687.6822913889. The cubic root of 1004109209 is about 1001.3678644271.

It can be divided in two parts, 1004 and 109209, that multiplied together give a triangular number (109645836 = T₁₄₈₀₈).

The spelling of 1004109209 in words is "one billion, four million, one hundred nine thousand, two hundred nine".