1232531305 has 4 divisors (see below), whose sum is σ = 1479037572. Its totient is φ = 986025040.

The previous prime is 1232531257. The next prime is 1232531327. The reversal of 1232531305 is 5031352321.

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 342583081 + 889948224 = 18509^2 + 29832^2 .

It is not a de Polignac number, because 1232531305 - 2²⁵ = 1198976873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1232531305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123253126 + ... + 123253135.

It is an arithmetic number, because the mean of its divisors is an integer number (369759393).

Almost surely, 2^1232531305 is an apocalyptic number.

It is an amenable number.

1232531305 is a deficient number, since it is larger than the sum of its proper divisors (246506267).

1232531305 is an equidigital number, since it uses as much as digits as its factorization.

1232531305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246506266.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 1232531305 is about 35107.4252117697. The cubic root of 1232531305 is about 1072.1757646127.

Adding to 1232531305 its reverse (5031352321), we get a palindrome (6263883626).

The spelling of 1232531305 in words is "one billion, two hundred thirty-two million, five hundred thirty-one thousand, three hundred five".