278535241 has 2 divisors, whose sum is σ = 278535242. Its totient is φ = 278535240.

The previous prime is 278535239. The next prime is 278535247. The reversal of 278535241 is 142535872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206353225 + 72182016 = 14365^2 + 8496^2 .

It is a cyclic number.

It is not a de Polignac number, because 278535241 - 2¹ = 278535239 is a prime.

Together with 278535239, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 278535241.

It is not a weakly prime, because it can be changed into another prime (278535247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139267620 + 139267621.

It is an arithmetic number, because the mean of its divisors is an integer number (139267621).

Almost surely, 2^278535241 is an apocalyptic number.

It is an amenable number.

278535241 is a deficient number, since it is larger than the sum of its proper divisors (1).

278535241 is an equidigital number, since it uses as much as digits as its factorization.

278535241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 37.

The square root of 278535241 is about 16689.3750931543. The cubic root of 278535241 is about 653.0704755838.

The spelling of 278535241 in words is "two hundred seventy-eight million, five hundred thirty-five thousand, two hundred forty-one".