1000991981992 has 16 divisors (see below), whose sum is σ = 1877687904960. Its totient is φ = 500275207344.

The previous prime is 1000991981989. The next prime is 1000991982007. The reversal of 1000991981992 is 2991891990001.

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, 27578688 + ... + 27614959.

It is an arithmetic number, because the mean of its divisors is an integer number (117355494060).

Almost surely, 2^{1000991981992} is an apocalyptic number.

It is an amenable number.

1000991981992 is a deficient number, since it is larger than the sum of its proper divisors (876695922968).

1000991981992 is a wasteful number, since it uses less digits than its factorization.

1000991981992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55195920 (or 55195916 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 58.

The spelling of 1000991981992 in words is "one trillion, nine hundred ninety-one million, nine hundred eighty-one thousand, nine hundred ninety-two".