1263503863 has 2 divisors, whose sum is σ = 1263503864. Its totient is φ = 1263503862.

The previous prime is 1263503849. The next prime is 1263503887. The reversal of 1263503863 is 3683053621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1263503863 - 2⁵ = 1263503831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263503803) 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, 631751931 + 631751932.

It is an arithmetic number, because the mean of its divisors is an integer number (631751932).

Almost surely, 2^1263503863 is an apocalyptic number.

1263503863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263503863 is an equidigital number, since it uses as much as digits as its factorization.

1263503863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 1263503863 is about 35545.7995127413. The cubic root of 1263503863 is about 1081.0825516452.

The spelling of 1263503863 in words is "one billion, two hundred sixty-three million, five hundred three thousand, eight hundred sixty-three".