1120109991 has 128 divisors (see below), whose sum is σ = 2184247296. Its totient is φ = 491028480.

The previous prime is 1120109989. The next prime is 1120110001. The reversal of 1120109991 is 1999010211.

It is not a de Polignac number, because 1120109991 - 2¹ = 1120109989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1120109911) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1888591 + ... + 1889183.

It is an arithmetic number, because the mean of its divisors is an integer number (17064432).

Almost surely, 2^1120109991 is an apocalyptic number.

1120109991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1120109991 is a deficient number, since it is larger than the sum of its proper divisors (1064137305).

1120109991 is a wasteful number, since it uses less digits than its factorization.

1120109991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681.

The product of its (nonzero) digits is 1458, while the sum is 33.

The square root of 1120109991 is about 33468.0443258939. The cubic root of 1120109991 is about 1038.5328149490.

It can be divided in two parts, 1120 and 109991, that added together give a palindrome (111111).

The spelling of 1120109991 in words is "one billion, one hundred twenty million, one hundred nine thousand, nine hundred ninety-one".