11111231992 has 64 divisors (see below), whose sum is σ = 24394867200. Its totient is φ = 4645226880.

The previous prime is 11111231969. The next prime is 11111232001. The reversal of 11111231992 is 29913211111.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 2210442 + ... + 2215462.

It is an arithmetic number, because the mean of its divisors is an integer number (381169800).

Almost surely, 2^11111231992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11111231992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12197433600).

11111231992 is an abundant number, since it is smaller than the sum of its proper divisors (13283635208).

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

11111231992 is a wasteful number, since it uses less digits than its factorization.

11111231992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996 (or 5992 counting only the distinct ones).

The product of its digits is 972, while the sum is 31.

The spelling of 11111231992 in words is "eleven billion, one hundred eleven million, two hundred thirty-one thousand, nine hundred ninety-two".