1305030505 has 4 divisors (see below), whose sum is σ = 1566036612. Its totient is φ = 1044024400.

The previous prime is 1305030487. The next prime is 1305030509. The reversal of 1305030505 is 5050305031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5050305031 = 641 ⋅7878791.

It can be written as a sum of positive squares in 2 ways, for example, as 197205849 + 1107824656 = 14043^2 + 33284^2 .

It is not a de Polignac number, because 1305030505 - 2¹⁷ = 1304899433 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1305030509) 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, 130503046 + ... + 130503055.

It is an arithmetic number, because the mean of its divisors is an integer number (391509153).

Almost surely, 2^1305030505 is an apocalyptic number.

It is an amenable number.

1305030505 is a deficient number, since it is larger than the sum of its proper divisors (261006107).

1305030505 is an equidigital number, since it uses as much as digits as its factorization.

1305030505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261006106.

The product of its (nonzero) digits is 1125, while the sum is 22.

The square root of 1305030505 is about 36125.2059509700. The cubic root of 1305030505 is about 1092.7988294214.

Adding to 1305030505 its reverse (5050305031), we get a palindrome (6355335536).

The spelling of 1305030505 in words is "one billion, three hundred five million, thirty thousand, five hundred five".