1321264393 has 2 divisors, whose sum is σ = 1321264394. Its totient is φ = 1321264392.

The previous prime is 1321264387. The next prime is 1321264403. The reversal of 1321264393 is 3934621231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 790284544 + 530979849 = 28112^2 + 23043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321264393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321264993) 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, 660632196 + 660632197.

It is an arithmetic number, because the mean of its divisors is an integer number (660632197).

Almost surely, 2^1321264393 is an apocalyptic number.

It is an amenable number.

1321264393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321264393 is an equidigital number, since it uses as much as digits as its factorization.

1321264393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 34.

The square root of 1321264393 is about 36349.2007202359. The cubic root of 1321264393 is about 1097.3114487653.

The spelling of 1321264393 in words is "one billion, three hundred twenty-one million, two hundred sixty-four thousand, three hundred ninety-three".