991112111012 has 6 divisors (see below), whose sum is σ = 1734446194278. Its totient is φ = 495556055504.

The previous prime is 991112110991. The next prime is 991112111029. The reversal of 991112111012 is 210111211199.

It can be written as a sum of positive squares in only one way, i.e., 515903173696 + 475208937316 = 718264^2 + 689354^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123889013873 + ... + 123889013880.

It is an arithmetic number, because the mean of its divisors is an integer number (289074365713).

Almost surely, 2^991112111012 is an apocalyptic number.

It is an amenable number.

991112111012 is a deficient number, since it is larger than the sum of its proper divisors (743334083266).

991112111012 is a wasteful number, since it uses less digits than its factorization.

991112111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247778027757 (or 247778027755 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 29.

The spelling of 991112111012 in words is "nine hundred ninety-one billion, one hundred twelve million, one hundred eleven thousand, twelve".