1313521291 has 2 divisors, whose sum is σ = 1313521292. Its totient is φ = 1313521290.

The previous prime is 1313521289. The next prime is 1313521327. The reversal of 1313521291 is 1921253131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1313521291 - 2¹ = 1313521289 is a prime.

Together with 1313521289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1313521591) 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 as a sum of consecutive naturals, namely, 656760645 + 656760646.

It is an arithmetic number, because the mean of its divisors is an integer number (656760646).

Almost surely, 2^1313521291 is an apocalyptic number.

1313521291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313521291 is an equidigital number, since it uses as much as digits as its factorization.

1313521291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 28.

The square root of 1313521291 is about 36242.5342794899. The cubic root of 1313521291 is about 1095.1636963280.

The spelling of 1313521291 in words is "one billion, three hundred thirteen million, five hundred twenty-one thousand, two hundred ninety-one".