1231136563 has 2 divisors, whose sum is σ = 1231136564. Its totient is φ = 1231136562.

The previous prime is 1231136519. The next prime is 1231136581. The reversal of 1231136563 is 3656311321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231136563 - 2²⁹ = 694265651 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231136363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615568281 + 615568282.

It is an arithmetic number, because the mean of its divisors is an integer number (615568282).

Almost surely, 2^1231136563 is an apocalyptic number.

1231136563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231136563 is an equidigital number, since it uses as much as digits as its factorization.

1231136563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 1231136563 is about 35087.5556714913. Note that the first 3 decimals coincide. The cubic root of 1231136563 is about 1071.7711844907.

Adding to 1231136563 its reverse (3656311321), we get a palindrome (4887447884).

The spelling of 1231136563 in words is "one billion, two hundred thirty-one million, one hundred thirty-six thousand, five hundred sixty-three".