1004219809 has 2 divisors, whose sum is σ = 1004219810. Its totient is φ = 1004219808.

The previous prime is 1004219803. The next prime is 1004219833. The reversal of 1004219809 is 9089124001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 965469184 + 38750625 = 31072^2 + 6225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004219809 - 2⁹ = 1004219297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1004219803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502109904 + 502109905.

It is an arithmetic number, because the mean of its divisors is an integer number (502109905).

Almost surely, 2^1004219809 is an apocalyptic number.

It is an amenable number.

1004219809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004219809 is an equidigital number, since it uses as much as digits as its factorization.

1004219809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1004219809 is about 31689.4274009487. The cubic root of 1004219809 is about 1001.4046290933.

The spelling of 1004219809 in words is "one billion, four million, two hundred nineteen thousand, eight hundred nine".