1097111808 has 108 divisors (see below), whose sum is σ = 3406663260. Its totient is φ = 337563648.

The previous prime is 1097111803. The next prime is 1097111833. The reversal of 1097111808 is 8081117901.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 632623104 + 464488704 = 25152^2 + 21552^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1097111803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11638 + ... + 48266.

Almost surely, 2^1097111808 is an apocalyptic number.

1097111808 is a gapful number since it is divisible by the number (18) 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 1097111808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1703331630).

1097111808 is an abundant number, since it is smaller than the sum of its proper divisors (2309551452).

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

1097111808 is a wasteful number, since it uses less digits than its factorization.

1097111808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36664 (or 36647 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 36.

The square root of 1097111808 is about 33122.6781525891. The cubic root of 1097111808 is about 1031.3758620156.

The spelling of 1097111808 in words is "one billion, ninety-seven million, one hundred eleven thousand, eight hundred eight".