2011901806 has 4 divisors (see below), whose sum is σ = 3017852712. Its totient is φ = 1005950902.

The previous prime is 2011901797. The next prime is 2011901813. The reversal of 2011901806 is 6081091102.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502975450 + ... + 502975453.

It is an arithmetic number, because the mean of its divisors is an integer number (754463178).

Almost surely, 2^2011901806 is an apocalyptic number.

2011901806 is a deficient number, since it is larger than the sum of its proper divisors (1005950906).

2011901806 is a wasteful number, since it uses less digits than its factorization.

2011901806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005950905.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 2011901806 is about 44854.2284071413. The cubic root of 2011901806 is about 1262.4153313281.

Adding to 2011901806 its reverse (6081091102), we get a palindrome (8092992908).

The spelling of 2011901806 in words is "two billion, eleven million, nine hundred one thousand, eight hundred six".