278868241 has 2 divisors, whose sum is σ = 278868242. Its totient is φ = 278868240.

The previous prime is 278868211. The next prime is 278868257. The reversal of 278868241 is 142868872.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275427216 + 3441025 = 16596^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 278868241 - 2¹¹ = 278866193 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 278868191 and 278868200.

It is not a weakly prime, because it can be changed into another prime (278868211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139434120 + 139434121.

It is an arithmetic number, because the mean of its divisors is an integer number (139434121).

Almost surely, 2^278868241 is an apocalyptic number.

It is an amenable number.

278868241 is a deficient number, since it is larger than the sum of its proper divisors (1).

278868241 is an equidigital number, since it uses as much as digits as its factorization.

278868241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 344064, while the sum is 46.

The square root of 278868241 is about 16699.3485202268. The cubic root of 278868241 is about 653.3306292116.

The spelling of 278868241 in words is "two hundred seventy-eight million, eight hundred sixty-eight thousand, two hundred forty-one".