1004042509 has 2 divisors, whose sum is σ = 1004042510. Its totient is φ = 1004042508.

The previous prime is 1004042467. The next prime is 1004042531. The reversal of 1004042509 is 9052404001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 724417225 + 279625284 = 26915^2 + 16722^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004042509 - 2⁷ = 1004042381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1004042309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502021254 + 502021255.

It is an arithmetic number, because the mean of its divisors is an integer number (502021255).

Almost surely, 2^1004042509 is an apocalyptic number.

It is an amenable number.

1004042509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004042509 is an equidigital number, since it uses as much as digits as its factorization.

1004042509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1004042509 is about 31686.6298144817. The cubic root of 1004042509 is about 1001.3456913026.

The spelling of 1004042509 in words is "one billion, four million, forty-two thousand, five hundred nine".