278981506949 has 2 divisors, whose sum is σ = 278981506950. Its totient is φ = 278981506948.

The previous prime is 278981506931. The next prime is 278981506987. The reversal of 278981506949 is 949605189872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276800149924 + 2181357025 = 526118^2 + 46705^2 .

It is a cyclic number.

It is not a de Polignac number, because 278981506949 - 2⁸ = 278981506693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278981506649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139490753474 + 139490753475.

It is an arithmetic number, because the mean of its divisors is an integer number (139490753475).

Almost surely, 2^278981506949 is an apocalyptic number.

It is an amenable number.

278981506949 is a deficient number, since it is larger than the sum of its proper divisors (1).

278981506949 is an equidigital number, since it uses as much as digits as its factorization.

278981506949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78382080, while the sum is 68.

The spelling of 278981506949 in words is "two hundred seventy-eight billion, nine hundred eighty-one million, five hundred six thousand, nine hundred forty-nine".