2011791609 has 9 divisors (see below), whose sum is σ = 2906115589. Its totient is φ = 1341104700.

The previous prime is 2011791589. The next prime is 2011791659. The reversal of 2011791609 is 9061971102.

The square root of 2011791609 is 44853.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 2011791609 - 2¹¹ = 2011789561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2011791659) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 127084 + ... + 142034.

Almost surely, 2^2011791609 is an apocalyptic number.

2011791609 is the 44853-rd square number.

2011791609 is the 22427-th centered octagonal number.

It is an amenable number.

2011791609 is a deficient number, since it is larger than the sum of its proper divisors (894323980).

2011791609 is an frugal number, since it uses more digits than its factorization.

2011791609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29908 (or 14954 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 36.

The cubic root of 2011791609 is about 1262.3922823367.

Multiplying 2011791609 by its sum of digits (36), we get a square (72424497924 = 269118²).

The spelling of 2011791609 in words is "two billion, eleven million, seven hundred ninety-one thousand, six hundred nine".