2111729 has 2 divisors, whose sum is σ = 2111730. Its totient is φ = 2111728.

The previous prime is 2111713. The next prime is 2111731. The reversal of 2111729 is 9271112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1151329 + 960400 = 1073^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111729 - 2⁴ = 2111713 is a prime.

It is a Sophie Germain prime.

Together with 2111731, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2111779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055864 + 1055865.

It is an arithmetic number, because the mean of its divisors is an integer number (1055865).

2^2111729 is an apocalyptic number.

It is an amenable number.

2111729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111729 is an equidigital number, since it uses as much as digits as its factorization.

2111729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 23.

The square root of 2111729 is about 1453.1789291068. The cubic root of 2111729 is about 128.2958853275.

The spelling of 2111729 in words is "two million, one hundred eleven thousand, seven hundred twenty-nine".