2011611805 has 8 divisors (see below), whose sum is σ = 2758781952. Its totient is φ = 1379390928.

The previous prime is 2011611803. The next prime is 2011611881. The reversal of 2011611805 is 5081161102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2011611805 - 2¹ = 2011611803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2011611805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011611803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28737277 + ... + 28737346.

It is an arithmetic number, because the mean of its divisors is an integer number (344847744).

Almost surely, 2^2011611805 is an apocalyptic number.

It is an amenable number.

2011611805 is a deficient number, since it is larger than the sum of its proper divisors (747170147).

2011611805 is an equidigital number, since it uses as much as digits as its factorization.

2011611805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57474635.

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 2011611805 is about 44850.9955853825. The cubic root of 2011611805 is about 1262.3546724200.

Adding to 2011611805 its reverse (5081161102), we get a palindrome (7092772907).

The spelling of 2011611805 in words is "two billion, eleven million, six hundred eleven thousand, eight hundred five".