2111491 has 2 divisors, whose sum is σ = 2111492. Its totient is φ = 2111490.

The previous prime is 2111471. The next prime is 2111497. The reversal of 2111491 is 1941112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2111491 - 2⁷ = 2111363 is a prime.

2111491 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2111497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055745 + 1055746.

It is an arithmetic number, because the mean of its divisors is an integer number (1055746).

2^2111491 is an apocalyptic number.

2111491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111491 is an equidigital number, since it uses as much as digits as its factorization.

2111491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 19.

The square root of 2111491 is about 1453.0970373654. The cubic root of 2111491 is about 128.2910653327.

The spelling of 2111491 in words is "two million, one hundred eleven thousand, four hundred ninety-one".