1000991891892 has 48 divisors (see below), whose sum is σ = 2503067882112. Its totient is φ = 310530971520.

The previous prime is 1000991891849. The next prime is 1000991891903. The reversal of 1000991891892 is 2981981990001.

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, 49000359 + ... + 49020782.

It is an arithmetic number, because the mean of its divisors is an integer number (52147247544).

Almost surely, 2^{1000991891892} is an apocalyptic number.

1000991891892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1000991891892 is an abundant number, since it is smaller than the sum of its proper divisors (1502075990220).

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

1000991891892 is a wasteful number, since it uses less digits than its factorization.

1000991891892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98021208 (or 98021206 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 57.

It can be divided in two parts, 100099 and 1891892, that added together give a palindrome (1991991).

The spelling of 1000991891892 in words is "one trillion, nine hundred ninety-one million, eight hundred ninety-one thousand, eight hundred ninety-two".