2011491931 has 4 divisors (see below), whose sum is σ = 2012146200. Its totient is φ = 2010837664.

The previous prime is 2011491793. The next prime is 2011491941. The reversal of 2011491931 is 1391941102.

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

It is a cyclic number.

It is not a de Polignac number, because 2011491931 - 2²⁵ = 1977937499 is a prime.

It is a super-2 number, since 2×2011491931² = 8092199576956217522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011491893 and 2011491902.

It is not an unprimeable number, because it can be changed into a prime (2011491941) 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, 322501 + ... + 328678.

It is an arithmetic number, because the mean of its divisors is an integer number (503036550).

Almost surely, 2^2011491931 is an apocalyptic number.

2011491931 is a deficient number, since it is larger than the sum of its proper divisors (654269).

2011491931 is an equidigital number, since it uses as much as digits as its factorization.

2011491931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654268.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 2011491931 is about 44849.6592071779. The cubic root of 2011491931 is about 1262.3295969209.

The spelling of 2011491931 in words is "two billion, eleven million, four hundred ninety-one thousand, nine hundred thirty-one".