278055289 has 2 divisors, whose sum is σ = 278055290. Its totient is φ = 278055288.

The previous prime is 278055287. The next prime is 278055311. The reversal of 278055289 is 982550872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214183225 + 63872064 = 14635^2 + 7992^2 .

It is a cyclic number.

It is not a de Polignac number, because 278055289 - 2¹ = 278055287 is a prime.

Together with 278055287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (278055287) 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, 139027644 + 139027645.

It is an arithmetic number, because the mean of its divisors is an integer number (139027645).

Almost surely, 2^278055289 is an apocalyptic number.

It is an amenable number.

278055289 is a deficient number, since it is larger than the sum of its proper divisors (1).

278055289 is an equidigital number, since it uses as much as digits as its factorization.

278055289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 278055289 is about 16674.9899250344. The cubic root of 278055289 is about 652.6951518173.

The spelling of 278055289 in words is "two hundred seventy-eight million, fifty-five thousand, two hundred eighty-nine".