1326431563 has 2 divisors, whose sum is σ = 1326431564. Its totient is φ = 1326431562.

The previous prime is 1326431543. The next prime is 1326431633. The reversal of 1326431563 is 3651346231.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1326431563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1326431543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663215781 + 663215782.

It is an arithmetic number, because the mean of its divisors is an integer number (663215782).

Almost surely, 2^1326431563 is an apocalyptic number.

1326431563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1326431563 is an equidigital number, since it uses as much as digits as its factorization.

1326431563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 34.

The square root of 1326431563 is about 36420.2081679938. The cubic root of 1326431563 is about 1098.7400347684.

Adding to 1326431563 its reverse (3651346231), we get a palindrome (4977777794).

The spelling of 1326431563 in words is "one billion, three hundred twenty-six million, four hundred thirty-one thousand, five hundred sixty-three".