1263963989 has 2 divisors, whose sum is σ = 1263963990. Its totient is φ = 1263963988.

The previous prime is 1263963941. The next prime is 1263964003. The reversal of 1263963989 is 9893693621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 764799025 + 499164964 = 27655^2 + 22342^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263963989 - 2¹⁶ = 1263898453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263963089) 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, 631981994 + 631981995.

It is an arithmetic number, because the mean of its divisors is an integer number (631981995).

Almost surely, 2^1263963989 is an apocalyptic number.

It is an amenable number.

1263963989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263963989 is an equidigital number, since it uses as much as digits as its factorization.

1263963989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3779136, while the sum is 56.

The square root of 1263963989 is about 35552.2712214002. The cubic root of 1263963989 is about 1081.2137671309.

The spelling of 1263963989 in words is "one billion, two hundred sixty-three million, nine hundred sixty-three thousand, nine hundred eighty-nine".