1020111109 has 4 divisors (see below), whose sum is σ = 1021045516. Its totient is φ = 1019176704.

The previous prime is 1020111107. The next prime is 1020111149. The reversal of 1020111109 is 9011110201.

1020111109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 902822209 + 117288900 = 30047^2 + 10830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020111109 - 2¹ = 1020111107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020111092 and 1020111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020111107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465564 + ... + 467749.

It is an arithmetic number, because the mean of its divisors is an integer number (255261379).

Almost surely, 2^1020111109 is an apocalyptic number.

It is an amenable number.

1020111109 is a deficient number, since it is larger than the sum of its proper divisors (934407).

1020111109 is an equidigital number, since it uses as much as digits as its factorization.

1020111109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934406.

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 1020111109 is about 31939.1782768436. The cubic root of 1020111109 is about 1006.6592588352.

The spelling of 1020111109 in words is "one billion, twenty million, one hundred eleven thousand, one hundred nine".