1331405233 has 4 divisors (see below), whose sum is σ = 1331486208. Its totient is φ = 1331324260.

The previous prime is 1331405213. The next prime is 1331405239. The reversal of 1331405233 is 3325041331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1331405233 - 2⁹ = 1331404721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331405198 and 1331405207.

It is not an unprimeable number, because it can be changed into a prime (1331405239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6073 + ... + 51958.

It is an arithmetic number, because the mean of its divisors is an integer number (332871552).

Almost surely, 2^1331405233 is an apocalyptic number.

It is an amenable number.

1331405233 is a deficient number, since it is larger than the sum of its proper divisors (80975).

1331405233 is an equidigital number, since it uses as much as digits as its factorization.

1331405233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80974.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 1331405233 is about 36488.4260142857. The cubic root of 1331405233 is about 1100.1116231079. Note that the first 3 decimals are identical.

Adding to 1331405233 its reverse (3325041331), we get a palindrome (4656446564).

The spelling of 1331405233 in words is "one billion, three hundred thirty-one million, four hundred five thousand, two hundred thirty-three".