1281152128 has 32 divisors (see below), whose sum is σ = 2634635520. Its totient is φ = 619910400.

The previous prime is 1281152087. The next prime is 1281152149. The reversal of 1281152128 is 8212511821.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 1281152128.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157468 + ... + 165403.

It is an arithmetic number, because the mean of its divisors is an integer number (82332360).

Almost surely, 2^1281152128 is an apocalyptic number.

It is an amenable number.

1281152128 is an abundant number, since it is smaller than the sum of its proper divisors (1353483392).

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

1281152128 is an equidigital number, since it uses as much as digits as its factorization.

1281152128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322916 (or 322904 counting only the distinct ones).

The product of its digits is 2560, while the sum is 31.

The square root of 1281152128 is about 35793.1854966836. The cubic root of 1281152128 is about 1086.0927152523.

Adding to 1281152128 its reverse (8212511821), we get a palindrome (9493663949).

The spelling of 1281152128 in words is "one billion, two hundred eighty-one million, one hundred fifty-two thousand, one hundred twenty-eight".