1312320263533 has 2 divisors, whose sum is σ = 1312320263534. Its totient is φ = 1312320263532.

The previous prime is 1312320263531. The next prime is 1312320263539. The reversal of 1312320263533 is 3353620232131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1310333511204 + 1986752329 = 1144698^2 + 44573^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312320263533 - 2¹ = 1312320263531 is a prime.

Together with 1312320263531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312320263531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656160131766 + 656160131767.

It is an arithmetic number, because the mean of its divisors is an integer number (656160131767).

Almost surely, 2^{1312320263533} is an apocalyptic number.

It is an amenable number.

1312320263533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312320263533 is an equidigital number, since it uses as much as digits as its factorization.

1312320263533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 34.

Adding to 1312320263533 its reverse (3353620232131), we get a palindrome (4665940495664).

The spelling of 1312320263533 in words is "one trillion, three hundred twelve billion, three hundred twenty million, two hundred sixty-three thousand, five hundred thirty-three".