1331233243 has 4 divisors (see below), whose sum is σ = 1331342280. Its totient is φ = 1331124208.

The previous prime is 1331233237. The next prime is 1331233291. The reversal of 1331233243 is 3423321331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331233243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331273243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33505 + ... + 61522.

It is an arithmetic number, because the mean of its divisors is an integer number (332835570).

Almost surely, 2^1331233243 is an apocalyptic number.

1331233243 is a deficient number, since it is larger than the sum of its proper divisors (109037).

1331233243 is an equidigital number, since it uses as much as digits as its factorization.

1331233243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109036.

The product of its digits is 3888, while the sum is 25.

The square root of 1331233243 is about 36486.0691634492. The cubic root of 1331233243 is about 1100.0642505171.

Adding to 1331233243 its reverse (3423321331), we get a palindrome (4754554574).

The spelling of 1331233243 in words is "one billion, three hundred thirty-one million, two hundred thirty-three thousand, two hundred forty-three".