1281376163 has 8 divisors (see below), whose sum is σ = 1286182800. Its totient is φ = 1276578688.

The previous prime is 1281376079. The next prime is 1281376189. The reversal of 1281376163 is 3616731821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1281376163 - 2²² = 1277181859 is a prime.

It is a super-2 number, since 2×1281376163² = 3283849742209205138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281376363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397703 + ... + 400911.

It is an arithmetic number, because the mean of its divisors is an integer number (160772850).

Almost surely, 2^1281376163 is an apocalyptic number.

1281376163 is a deficient number, since it is larger than the sum of its proper divisors (4806637).

1281376163 is an equidigital number, since it uses as much as digits as its factorization.

1281376163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4581.

The product of its digits is 36288, while the sum is 38.

The square root of 1281376163 is about 35796.3149360378. The cubic root of 1281376163 is about 1086.1560198863.

The spelling of 1281376163 in words is "one billion, two hundred eighty-one million, three hundred seventy-six thousand, one hundred sixty-three".