111111111090 has 192 divisors, whose sum is σ = 341401761792. Its totient is φ = 24534835200.

The previous prime is 111111111049. The next prime is 111111111091. The reversal of 111111111090 is 90111111111.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (111111111091) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11967250 + ... + 11976530.

It is an arithmetic number, because the mean of its divisors is an integer number (1778134176).

Almost surely, 2^111111111090 is an apocalyptic number.

111111111090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 111111111090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170700880896).

111111111090 is an abundant number, since it is smaller than the sum of its proper divisors (230290650702).

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

111111111090 is a wasteful number, since it uses less digits than its factorization.

111111111090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9945 (or 9942 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 18.

The spelling of 111111111090 in words is "one hundred eleven billion, one hundred eleven million, one hundred eleven thousand, ninety".