1280775163 has 2 divisors, whose sum is σ = 1280775164. Its totient is φ = 1280775162.

The previous prime is 1280775151. The next prime is 1280775173. The reversal of 1280775163 is 3615770821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1280775163 - 2⁵ = 1280775131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280775173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640387581 + 640387582.

It is an arithmetic number, because the mean of its divisors is an integer number (640387582).

Almost surely, 2^1280775163 is an apocalyptic number.

1280775163 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280775163 is an equidigital number, since it uses as much as digits as its factorization.

1280775163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 1280775163 is about 35787.9192326126. The cubic root of 1280775163 is about 1085.9861811690.

The spelling of 1280775163 in words is "one billion, two hundred eighty million, seven hundred seventy-five thousand, one hundred sixty-three".