1280555163 has 20 divisors (see below), whose sum is σ = 1964633440. Its totient is φ = 830628432.

The previous prime is 1280555149. The next prime is 1280555183. The reversal of 1280555163 is 3615550821.

It is a happy number.

1280555163 is a `hidden beast` number, since 12 + 80 + 55 + 516 + 3 = 666.

1280555163 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1280555163 - 2⁵ = 1280555131 is a prime.

It is a super-3 number, since 3×1280555163³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280555113) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 210643 + ... + 216636.

It is an arithmetic number, because the mean of its divisors is an integer number (98231672).

Almost surely, 2^1280555163 is an apocalyptic number.

1280555163 is a deficient number, since it is larger than the sum of its proper divisors (684078277).

1280555163 is an equidigital number, since it uses as much as digits as its factorization.

1280555163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427328 (or 427319 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 1280555163 is about 35784.8454376989. The cubic root of 1280555163 is about 1085.9239973062.

The spelling of 1280555163 in words is "one billion, two hundred eighty million, five hundred fifty-five thousand, one hundred sixty-three".