1321311241 has 2 divisors, whose sum is σ = 1321311242. Its totient is φ = 1321311240.

The previous prime is 1321311239. The next prime is 1321311263. The reversal of 1321311241 is 1421131231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085043600 + 236267641 = 32940^2 + 15371^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321311241 - 2¹ = 1321311239 is a prime.

Together with 1321311239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1321317241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660655620 + 660655621.

It is an arithmetic number, because the mean of its divisors is an integer number (660655621).

Almost surely, 2^1321311241 is an apocalyptic number.

It is an amenable number.

1321311241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321311241 is an equidigital number, since it uses as much as digits as its factorization.

1321311241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 1321311241 is about 36349.8451303441. The cubic root of 1321311241 is about 1097.3244177162.

Adding to 1321311241 its reverse (1421131231), we get a palindrome (2742442472).

The spelling of 1321311241 in words is "one billion, three hundred twenty-one million, three hundred eleven thousand, two hundred forty-one".