1530309509 has 4 divisors (see below), whose sum is σ = 1534694700. Its totient is φ = 1525924320.

The previous prime is 1530309503. The next prime is 1530309511. The reversal of 1530309509 is 9059030351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1093624900 + 436684609 = 33070^2 + 20897^2 .

It is a cyclic number.

It is not a de Polignac number, because 1530309509 - 2⁴ = 1530309493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1530309503) 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 in 3 ways as a sum of consecutive naturals, for example, 2192072 + ... + 2192769.

It is an arithmetic number, because the mean of its divisors is an integer number (383673675).

Almost surely, 2^1530309509 is an apocalyptic number.

It is an amenable number.

1530309509 is a deficient number, since it is larger than the sum of its proper divisors (4385191).

1530309509 is an equidigital number, since it uses as much as digits as its factorization.

1530309509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4385190.

The product of its (nonzero) digits is 18225, while the sum is 35.

The square root of 1530309509 is about 39119.1706072611. The cubic root of 1530309509 is about 1152.3730478784.

The spelling of 1530309509 in words is "one billion, five hundred thirty million, three hundred nine thousand, five hundred nine".