1281199881312 has 96 divisors (see below), whose sum is σ = 4024281713760. Its totient is φ = 394215344640.

The previous prime is 1281199881307. The next prime is 1281199881331. The reversal of 1281199881312 is 2131889911821.

It is a happy number.

1281199881312 is a `hidden beast` number, since 128 + 119 + 98 + 8 + 1 + 312 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57022239 + ... + 57044702.

It is an arithmetic number, because the mean of its divisors is an integer number (41919601185).

Almost surely, 2^{1281199881312} is an apocalyptic number.

1281199881312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1281199881312 is an abundant number, since it is smaller than the sum of its proper divisors (2743081832448).

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

1281199881312 is a wasteful number, since it uses less digits than its factorization.

1281199881312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114066973 (or 114066959 counting only the distinct ones).

The product of its digits is 497664, while the sum is 54.

The spelling of 1281199881312 in words is "one trillion, two hundred eighty-one billion, one hundred ninety-nine million, eight hundred eighty-one thousand, three hundred twelve".