1089000000 has 441 divisors, whose sum is σ = 4288675573. Its totient is φ = 264000000.

The previous prime is 1088999969. The next prime is 1089000001. The reversal of 1089000000 is 9801.

The square root of 1089000000 is 33000.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 3 ways, for example, as 954068544 + 134931456 = 30888^2 + 11616^2 .

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1089000001) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 98999995 + ... + 99000005.

Almost surely, 2^1089000000 is an apocalyptic number.

1089000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1089000000 is the 33000-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1089000000

1089000000 is an abundant number, since it is smaller than the sum of its proper divisors (3199675573).

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

1089000000 is an frugal number, since it uses more digits than its factorization.

1089000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The cubic root of 1089000000 is about 1028.8276478102.

Adding to 1089000000 its reverse (9801), we get a palindrome (1089009801).

Multiplying 1089000000 by its reverse (9801), we get a square (10673289000000 = 3267000²).

The spelling of 1089000000 in words is "one billion, eighty-nine million", and thus it is an aban number and an uban number.