255999949 has 2 divisors, whose sum is σ = 255999950. Its totient is φ = 255999948.

The previous prime is 255999937. The next prime is 255999967. The reversal of 255999949 is 949999552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129549924 + 126450025 = 11382^2 + 11245^2 .

It is a cyclic number.

It is not a de Polignac number, because 255999949 - 2¹¹ = 255997901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255999979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127999974 + 127999975.

It is an arithmetic number, because the mean of its divisors is an integer number (127999975).

Almost surely, 2^255999949 is an apocalyptic number.

It is an amenable number.

255999949 is a deficient number, since it is larger than the sum of its proper divisors (1).

255999949 is an equidigital number, since it uses as much as digits as its factorization.

255999949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11809800, while the sum is 61.

The square root of 255999949 is about 15999.9984062499. The cubic root of 255999949 is about 634.9603786219.

The spelling of 255999949 in words is "two hundred fifty-five million, nine hundred ninety-nine thousand, nine hundred forty-nine".