1281440552 has 96 divisors (see below), whose sum is σ = 3055345920. Its totient is φ = 500129280.

The previous prime is 1281440543. The next prime is 1281440557. The reversal of 1281440552 is 2550441821.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1281440557) 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 23 ways as a sum of consecutive naturals, for example, 203483 + ... + 209685.

It is an arithmetic number, because the mean of its divisors is an integer number (31826520).

Almost surely, 2^1281440552 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 1281440552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1527672960).

1281440552 is an abundant number, since it is smaller than the sum of its proper divisors (1773905368).

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

1281440552 is a wasteful number, since it uses less digits than its factorization.

1281440552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6271 (or 6260 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 1281440552 is about 35797.2143050266. The cubic root of 1281440552 is about 1086.1742126519.

The spelling of 1281440552 in words is "one billion, two hundred eighty-one million, four hundred forty thousand, five hundred fifty-two".