2127691 has 2 divisors, whose sum is σ = 2127692. Its totient is φ = 2127690.

The previous prime is 2127689. The next prime is 2127721. The reversal of 2127691 is 1967212.

It is a happy number.

2127691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2127691 - 2¹ = 2127689 is a prime.

Together with 2127689, 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 (2127641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063845 + 1063846.

It is an arithmetic number, because the mean of its divisors is an integer number (1063846).

2^2127691 is an apocalyptic number.

2127691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2127691 is an equidigital number, since it uses as much as digits as its factorization.

2127691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 2127691 is about 1458.6606870688. The cubic root of 2127691 is about 128.6183258078.

The spelling of 2127691 in words is "two million, one hundred twenty-seven thousand, six hundred ninety-one".