1331330243 has 4 divisors (see below), whose sum is σ = 1341048120. Its totient is φ = 1321612368.

The previous prime is 1331330239. The next prime is 1331330249. The reversal of 1331330243 is 3420331331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1331330243 - 2² = 1331330239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331330249) 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, 4858733 + ... + 4859006.

It is an arithmetic number, because the mean of its divisors is an integer number (335262030).

Almost surely, 2^1331330243 is an apocalyptic number.

1331330243 is a deficient number, since it is larger than the sum of its proper divisors (9717877).

1331330243 is an equidigital number, since it uses as much as digits as its factorization.

1331330243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9717876.

The product of its (nonzero) digits is 1944, while the sum is 23.

The square root of 1331330243 is about 36487.3984136989. The cubic root of 1331330243 is about 1100.0909685099.

Adding to 1331330243 its reverse (3420331331), we get a palindrome (4751661574).

The spelling of 1331330243 in words is "one billion, three hundred thirty-one million, three hundred thirty thousand, two hundred forty-three".