1321013263 has 2 divisors, whose sum is σ = 1321013264. Its totient is φ = 1321013262.

The previous prime is 1321013231. The next prime is 1321013357. The reversal of 1321013263 is 3623101231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321013263 - 2⁵ = 1321013231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321013063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660506631 + 660506632.

It is an arithmetic number, because the mean of its divisors is an integer number (660506632).

Almost surely, 2^1321013263 is an apocalyptic number.

1321013263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321013263 is an equidigital number, since it uses as much as digits as its factorization.

1321013263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 1321013263 is about 36345.7461472453. The cubic root of 1321013263 is about 1097.2419231185.

Adding to 1321013263 its reverse (3623101231), we get a palindrome (4944114494).

The spelling of 1321013263 in words is "one billion, three hundred twenty-one million, thirteen thousand, two hundred sixty-three".