1281163481 has 12 divisors (see below), whose sum is σ = 1408013712. Its totient is φ = 1164951216.

The previous prime is 1281163453. The next prime is 1281163493. The reversal of 1281163481 is 1843611821.

It is not a de Polignac number, because 1281163481 - 2¹⁴ = 1281147097 is a prime.

It is a super-2 number, since 2×1281163481² = 3282759730096074722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281168481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45251 + ... + 67896.

It is an arithmetic number, because the mean of its divisors is an integer number (117334476).

Almost surely, 2^1281163481 is an apocalyptic number.

It is an amenable number.

1281163481 is a deficient number, since it is larger than the sum of its proper divisors (126850231).

1281163481 is a wasteful number, since it uses less digits than its factorization.

1281163481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113240 (or 113227 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 1281163481 is about 35793.3440879726. The cubic root of 1281163481 is about 1086.0959233996.

The spelling of 1281163481 in words is "one billion, two hundred eighty-one million, one hundred sixty-three thousand, four hundred eighty-one".