278255249 has 2 divisors, whose sum is σ = 278255250. Its totient is φ = 278255248.

The previous prime is 278255231. The next prime is 278255251. The reversal of 278255249 is 942552872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261404224 + 16851025 = 16168^2 + 4105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278255249 is a prime.

Together with 278255251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (278255149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139127624 + 139127625.

It is an arithmetic number, because the mean of its divisors is an integer number (139127625).

Almost surely, 2^278255249 is an apocalyptic number.

It is an amenable number.

278255249 is a deficient number, since it is larger than the sum of its proper divisors (1).

278255249 is an equidigital number, since it uses as much as digits as its factorization.

278255249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 44.

The square root of 278255249 is about 16680.9846531912. The cubic root of 278255249 is about 652.8515735250.

The spelling of 278255249 in words is "two hundred seventy-eight million, two hundred fifty-five thousand, two hundred forty-nine".