2011209491 has 2 divisors, whose sum is σ = 2011209492. Its totient is φ = 2011209490.

The previous prime is 2011209469. The next prime is 2011209509. The reversal of 2011209491 is 1949021102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2011209491 - 2¹⁰ = 2011208467 is a prime.

It is not a weakly prime, because it can be changed into another prime (2011209461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005604745 + 1005604746.

It is an arithmetic number, because the mean of its divisors is an integer number (1005604746).

Almost surely, 2^2011209491 is an apocalyptic number.

2011209491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011209491 is an equidigital number, since it uses as much as digits as its factorization.

2011209491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 2011209491 is about 44846.5103547645. The cubic root of 2011209491 is about 1262.2705115799.

The spelling of 2011209491 in words is "two billion, eleven million, two hundred nine thousand, four hundred ninety-one".