2128591 has 2 divisors, whose sum is σ = 2128592. Its totient is φ = 2128590.

The previous prime is 2128561. The next prime is 2128601. The reversal of 2128591 is 1958212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2128591 - 2⁵ = 2128559 is a prime.

It is a Chen prime.

2128591 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2128501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064295 + 1064296.

It is an arithmetic number, because the mean of its divisors is an integer number (1064296).

2^2128591 is an apocalyptic number.

2128591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128591 is an equidigital number, since it uses as much as digits as its factorization.

2128591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

The square root of 2128591 is about 1458.9691566308. The cubic root of 2128591 is about 128.6364581675.

The spelling of 2128591 in words is "two million, one hundred twenty-eight thousand, five hundred ninety-one".