2255681 has 2 divisors, whose sum is σ = 2255682. Its totient is φ = 2255680.

The previous prime is 2255677. The next prime is 2255717. The reversal of 2255681 is 1865522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1985281 + 270400 = 1409^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 2255681 - 2² = 2255677 is a prime.

It is a super-2 number, since 2×2255681² = 10176193547522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2255621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1127840 + 1127841.

It is an arithmetic number, because the mean of its divisors is an integer number (1127841).

2^2255681 is an apocalyptic number.

It is an amenable number.

2255681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2255681 is an equidigital number, since it uses as much as digits as its factorization.

2255681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 2255681 is about 1501.8924728488. The cubic root of 2255681 is about 131.1472617020.

The spelling of 2255681 in words is "two million, two hundred fifty-five thousand, six hundred eighty-one".