1281328031976 has 32 divisors (see below), whose sum is σ = 3219580599840. Its totient is φ = 424941274688.

The previous prime is 1281328031969. The next prime is 1281328031981. The reversal of 1281328031976 is 6791308231821.

It is a super-3 number, since 3×1281328031976³ (a number of 37 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 135499506 + ... + 135508961.

It is an arithmetic number, because the mean of its divisors is an integer number (100611893745).

Almost surely, 2^{1281328031976} is an apocalyptic number.

It is an amenable number.

1281328031976 is an abundant number, since it is smaller than the sum of its proper divisors (1938252567864).

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

1281328031976 is a wasteful number, since it uses less digits than its factorization.

1281328031976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271008673 (or 271008669 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 1281328031976 in words is "one trillion, two hundred eighty-one billion, three hundred twenty-eight million, thirty-one thousand, nine hundred seventy-six".