1155109020 has 48 divisors (see below), whose sum is σ = 3483100320. Its totient is φ = 284334336.

The previous prime is 1155109001. The next prime is 1155109037. The reversal of 1155109020 is 209015511.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739675 + ... + 741234.

It is an arithmetic number, because the mean of its divisors is an integer number (72564590).

Almost surely, 2^1155109020 is an apocalyptic number.

1155109020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155109020 is an abundant number, since it is smaller than the sum of its proper divisors (2327991300).

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

1155109020 is a wasteful number, since it uses less digits than its factorization.

1155109020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480934 (or 1480932 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 1155109020 is about 33986.8948272713. The cubic root of 1155109020 is about 1049.2387588976.

The spelling of 1155109020 in words is "one billion, one hundred fifty-five million, one hundred nine thousand, twenty".