2011161709 has 4 divisors (see below), whose sum is σ = 2016924700. Its totient is φ = 2005398720.

The previous prime is 2011161707. The next prime is 2011161749. The reversal of 2011161709 is 9071611102.

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 1428084100 + 583077609 = 37790^2 + 24147^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011161709 - 2¹ = 2011161707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011161701) 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, 2880972 + ... + 2881669.

It is an arithmetic number, because the mean of its divisors is an integer number (504231175).

Almost surely, 2^2011161709 is an apocalyptic number.

It is an amenable number.

2011161709 is a deficient number, since it is larger than the sum of its proper divisors (5762991).

2011161709 is an equidigital number, since it uses as much as digits as its factorization.

2011161709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5762990.

The product of its (nonzero) digits is 756, while the sum is 28.

The square root of 2011161709 is about 44845.9776234168. The cubic root of 2011161709 is about 1262.2605152257.

The spelling of 2011161709 in words is "two billion, eleven million, one hundred sixty-one thousand, seven hundred nine".