255800261 has 2 divisors, whose sum is σ = 255800262. Its totient is φ = 255800260.

The previous prime is 255800243. The next prime is 255800263. The reversal of 255800261 is 162008552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156100036 + 99700225 = 12494^2 + 9985^2 .

It is a cyclic number.

It is not a de Polignac number, because 255800261 - 2¹⁰ = 255799237 is a prime.

Together with 255800263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255800263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127900130 + 127900131.

It is an arithmetic number, because the mean of its divisors is an integer number (127900131).

Almost surely, 2^255800261 is an apocalyptic number.

It is an amenable number.

255800261 is a deficient number, since it is larger than the sum of its proper divisors (1).

255800261 is an equidigital number, since it uses as much as digits as its factorization.

255800261 is an evil number, because the sum of its binary digits is even.

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

The square root of 255800261 is about 15993.7569382556. The cubic root of 255800261 is about 634.7952393310.

The spelling of 255800261 in words is "two hundred fifty-five million, eight hundred thousand, two hundred sixty-one".