1230543305 has 4 divisors (see below), whose sum is σ = 1476651972. Its totient is φ = 984434640.

The previous prime is 1230543289. The next prime is 1230543311. The reversal of 1230543305 is 5033450321.

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 570875449 + 659667856 = 23893^2 + 25684^2 .

It is not a de Polignac number, because 1230543305 - 2⁴ = 1230543289 is a prime.

It is a super-3 number, since 3×1230543305³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123054326 + ... + 123054335.

It is an arithmetic number, because the mean of its divisors is an integer number (369162993).

Almost surely, 2^1230543305 is an apocalyptic number.

It is an amenable number.

1230543305 is a deficient number, since it is larger than the sum of its proper divisors (246108667).

1230543305 is an equidigital number, since it uses as much as digits as its factorization.

1230543305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246108666.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 1230543305 is about 35079.1006868762. The cubic root of 1230543305 is about 1071.5990024036.

Adding to 1230543305 its reverse (5033450321), we get a palindrome (6263993626).

The spelling of 1230543305 in words is "one billion, two hundred thirty million, five hundred forty-three thousand, three hundred five".