1281159168 has 104 divisors (see below), whose sum is σ = 3617538768. Its totient is φ = 401866752.

The previous prime is 1281159119. The next prime is 1281159181. The reversal of 1281159168 is 8619511821.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205830 + ... + 211962.

Almost surely, 2^1281159168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281159168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1808769384).

1281159168 is an abundant number, since it is smaller than the sum of its proper divisors (2336379600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281159168 is an equidigital number, since it uses as much as digits as its factorization.

1281159168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6177 (or 6155 counting only the distinct ones).

The product of its digits is 34560, while the sum is 42.

The square root of 1281159168 is about 35793.2838392903. The cubic root of 1281159168 is about 1086.0947046280.

The spelling of 1281159168 in words is "one billion, two hundred eighty-one million, one hundred fifty-nine thousand, one hundred sixty-eight".