1281291112 has 16 divisors (see below), whose sum is σ = 2447750340. Its totient is φ = 628557696.

The previous prime is 1281291103. The next prime is 1281291131. The reversal of 1281291112 is 2111921821.

It can be written as a sum of positive squares in 2 ways, for example, as 1235241316 + 46049796 = 35146^2 + 6786^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510533 + ... + 1511380.

Almost surely, 2^1281291112 is an apocalyptic number.

It is an amenable number.

1281291112 is a deficient number, since it is larger than the sum of its proper divisors (1166459228).

1281291112 is a wasteful number, since it uses less digits than its factorization.

1281291112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3021972 (or 3021968 counting only the distinct ones).

The product of its digits is 576, while the sum is 28.

The square root of 1281291112 is about 35795.1269309106. The cubic root of 1281291112 is about 1086.1319882495.

The spelling of 1281291112 in words is "one billion, two hundred eighty-one million, two hundred ninety-one thousand, one hundred twelve".