1263276779 has 2 divisors, whose sum is σ = 1263276780. Its totient is φ = 1263276778.

The previous prime is 1263276767. The next prime is 1263276797. The reversal of 1263276779 is 9776723621.

Together with next prime (1263276797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1263276779 - 2⁸ = 1263276523 is a prime.

It is a super-2 number, since 2×1263276779² = 3191736440721229682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1263276799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631638389 + 631638390.

It is an arithmetic number, because the mean of its divisors is an integer number (631638390).

Almost surely, 2^1263276779 is an apocalyptic number.

1263276779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263276779 is an equidigital number, since it uses as much as digits as its factorization.

1263276779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 50.

The square root of 1263276779 is about 35542.6051239917. The cubic root of 1263276779 is about 1081.0177816918.

The spelling of 1263276779 in words is "one billion, two hundred sixty-three million, two hundred seventy-six thousand, seven hundred seventy-nine".