1281109429152 has 576 divisors, whose sum is σ = 4432619842560. Its totient is φ = 356426459136.

The previous prime is 1281109429147. The next prime is 1281109429199. The reversal of 1281109429152 is 2519249011821.

It is a junction number, because it is equal to n+sod(n) for n = 1281109429098 and 1281109429107.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 324576043 + ... + 324579989.

It is an arithmetic number, because the mean of its divisors is an integer number (7695520560).

Almost surely, 2^{1281109429152} is an apocalyptic number.

1281109429152 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281109429152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2216309921280).

1281109429152 is an abundant number, since it is smaller than the sum of its proper divisors (3151510413408).

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

1281109429152 is an equidigital number, since it uses as much as digits as its factorization.

1281109429152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4135 (or 4115 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The spelling of 1281109429152 in words is "one trillion, two hundred eighty-one billion, one hundred nine million, four hundred twenty-nine thousand, one hundred fifty-two".