278948897 has 2 divisors, whose sum is σ = 278948898. Its totient is φ = 278948896.

The previous prime is 278948867. The next prime is 278948983. The reversal of 278948897 is 798849872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263770081 + 15178816 = 16241^2 + 3896^2 .

It is a cyclic number.

It is not a de Polignac number, because 278948897 - 2¹² = 278944801 is a prime.

It is not a weakly prime, because it can be changed into another prime (278948837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139474448 + 139474449.

It is an arithmetic number, because the mean of its divisors is an integer number (139474449).

Almost surely, 2^278948897 is an apocalyptic number.

It is an amenable number.

278948897 is a deficient number, since it is larger than the sum of its proper divisors (1).

278948897 is an equidigital number, since it uses as much as digits as its factorization.

278948897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 62.

The square root of 278948897 is about 16701.7632901439. The cubic root of 278948897 is about 653.3936099172.

The spelling of 278948897 in words is "two hundred seventy-eight million, nine hundred forty-eight thousand, eight hundred ninety-seven".