1331111563 has 2 divisors, whose sum is σ = 1331111564. Its totient is φ = 1331111562.

The previous prime is 1331111533. The next prime is 1331111647. The reversal of 1331111563 is 3651111331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1331111563 - 2⁵ = 1331111531 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331111533) 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, 665555781 + 665555782.

It is an arithmetic number, because the mean of its divisors is an integer number (665555782).

Almost surely, 2^1331111563 is an apocalyptic number.

1331111563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331111563 is an equidigital number, since it uses as much as digits as its factorization.

1331111563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 25.

The square root of 1331111563 is about 36484.4016396048. The cubic root of 1331111563 is about 1100.0307327502.

Adding to 1331111563 its reverse (3651111331), we get a palindrome (4982222894).

The spelling of 1331111563 in words is "one billion, three hundred thirty-one million, one hundred eleven thousand, five hundred sixty-three".