1005019409 has 2 divisors, whose sum is σ = 1005019410. Its totient is φ = 1005019408.

The previous prime is 1005019403. The next prime is 1005019427. The reversal of 1005019409 is 9049105001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619761025 + 385258384 = 24895^2 + 19628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005019409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1005019403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502509704 + 502509705.

It is an arithmetic number, because the mean of its divisors is an integer number (502509705).

Almost surely, 2^1005019409 is an apocalyptic number.

It is an amenable number.

1005019409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005019409 is an equidigital number, since it uses as much as digits as its factorization.

1005019409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 1005019409 is about 31702.0410857093. The cubic root of 1005019409 is about 1001.6703447284.

The spelling of 1005019409 in words is "one billion, five million, nineteen thousand, four hundred nine".