255805999 has 2 divisors, whose sum is σ = 255806000. Its totient is φ = 255805998.

The previous prime is 255805997. The next prime is 255806059. The reversal of 255805999 is 999508552.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255805999 - 2¹ = 255805997 is a prime.

Together with 255805997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255805997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127902999 + 127903000.

It is an arithmetic number, because the mean of its divisors is an integer number (127903000).

Almost surely, 2^255805999 is an apocalyptic number.

255805999 is a deficient number, since it is larger than the sum of its proper divisors (1).

255805999 is an equidigital number, since it uses as much as digits as its factorization.

255805999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 52.

The square root of 255805999 is about 15993.9363197432. The cubic root of 255805999 is about 634.7999857790.

The spelling of 255805999 in words is "two hundred fifty-five million, eight hundred five thousand, nine hundred ninety-nine".