2011011491 has 2 divisors, whose sum is σ = 2011011492. Its totient is φ = 2011011490.

The previous prime is 2011011421. The next prime is 2011011493. The reversal of 2011011491 is 1941101102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2011011491 - 2¹⁰ = 2011010467 is a prime.

Together with 2011011493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2011011493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005505745 + 1005505746.

It is an arithmetic number, because the mean of its divisors is an integer number (1005505746).

Almost surely, 2^2011011491 is an apocalyptic number.

2011011491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011011491 is an equidigital number, since it uses as much as digits as its factorization.

2011011491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 2011011491 is about 44844.3027708091. The cubic root of 2011011491 is about 1262.2290874576.

Adding to 2011011491 its reverse (1941101102), we get a palindrome (3952112593).

The spelling of 2011011491 in words is "two billion, eleven million, eleven thousand, four hundred ninety-one".