2128261 has 2 divisors, whose sum is σ = 2128262. Its totient is φ = 2128260.

The previous prime is 2128253. The next prime is 2128267. The reversal of 2128261 is 1628212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 11236 = 1455^2 + 106^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128261 - 2³ = 2128253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2128267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064130 + 1064131.

It is an arithmetic number, because the mean of its divisors is an integer number (1064131).

2^2128261 is an apocalyptic number.

It is an amenable number.

2128261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128261 is an equidigital number, since it uses as much as digits as its factorization.

2128261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 22.

The square root of 2128261 is about 1458.8560586980. The cubic root of 2128261 is about 128.6298102292.

It can be divided in two parts, 21 and 28261, that added together give a palindrome (28282).

The spelling of 2128261 in words is "two million, one hundred twenty-eight thousand, two hundred sixty-one".