1331321011 has 4 divisors (see below), whose sum is σ = 1340899000. Its totient is φ = 1321743024.

The previous prime is 1331321003. The next prime is 1331321027. The reversal of 1331321011 is 1101231331.

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 1331321011 - 2³ = 1331321003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331321111) 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, 4788786 + ... + 4789063.

It is an arithmetic number, because the mean of its divisors is an integer number (335224750).

Almost surely, 2^1331321011 is an apocalyptic number.

1331321011 is a deficient number, since it is larger than the sum of its proper divisors (9577989).

1331321011 is an equidigital number, since it uses as much as digits as its factorization.

1331321011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9577988.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1331321011 is about 36487.2719040490. The cubic root of 1331321011 is about 1100.0884256739.

Adding to 1331321011 its reverse (1101231331), we get a palindrome (2432552342).

The spelling of 1331321011 in words is "one billion, three hundred thirty-one million, three hundred twenty-one thousand, eleven".