1121091000 has 128 divisors (see below), whose sum is σ = 3572674560. Its totient is φ = 292560000.

The previous prime is 1121090987. The next prime is 1121091071. The reversal of 1121091000 is 1901211.

1121091000 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137025 + ... + 144975.

It is an arithmetic number, because the mean of its divisors is an integer number (27911520).

Almost surely, 2^1121091000 is an apocalyptic number.

1121091000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121091000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1786337280).

1121091000 is an abundant number, since it is smaller than the sum of its proper divisors (2451583560).

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

1121091000 is a wasteful number, since it uses less digits than its factorization.

1121091000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8022 (or 8008 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 15.

The square root of 1121091000 is about 33482.6970239854. The cubic root of 1121091000 is about 1038.8359139784.

Adding to 1121091000 its reverse (1901211), we get a palindrome (1122992211).

The spelling of 1121091000 in words is "one billion, one hundred twenty-one million, ninety-one thousand".