1305140233 has 8 divisors (see below), whose sum is σ = 1321815240. Its totient is φ = 1288510080.

The previous prime is 1305140203. The next prime is 1305140251. The reversal of 1305140233 is 3320415031.

It can be written as a sum of positive squares in 4 ways, for example, as 284529424 + 1020610809 = 16868^2 + 31947^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1305140233 - 2¹⁷ = 1305009161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1305140203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49423 + ... + 71083.

It is an arithmetic number, because the mean of its divisors is an integer number (165226905).

Almost surely, 2^1305140233 is an apocalyptic number.

It is an amenable number.

1305140233 is a deficient number, since it is larger than the sum of its proper divisors (16675007).

1305140233 is an equidigital number, since it uses as much as digits as its factorization.

1305140233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22427.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 1305140233 is about 36126.7246370329. The cubic root of 1305140233 is about 1092.8294563605.

Adding to 1305140233 its reverse (3320415031), we get a palindrome (4625555264).

The spelling of 1305140233 in words is "one billion, three hundred five million, one hundred forty thousand, two hundred thirty-three".