278845249 has 2 divisors, whose sum is σ = 278845250. Its totient is φ = 278845248.

The previous prime is 278845247. The next prime is 278845297. The reversal of 278845249 is 942548872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177742224 + 101103025 = 13332^2 + 10055^2 .

It is a cyclic number.

It is not a de Polignac number, because 278845249 - 2¹ = 278845247 is a prime.

Together with 278845247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (278845247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139422624 + 139422625.

It is an arithmetic number, because the mean of its divisors is an integer number (139422625).

Almost surely, 2^278845249 is an apocalyptic number.

It is an amenable number.

278845249 is a deficient number, since it is larger than the sum of its proper divisors (1).

278845249 is an equidigital number, since it uses as much as digits as its factorization.

278845249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 49.

The square root of 278845249 is about 16698.6600959478. The cubic root of 278845249 is about 653.3126735507.

It can be divided in two parts, 27884 and 5249, that added together give a palindrome (33133).

The spelling of 278845249 in words is "two hundred seventy-eight million, eight hundred forty-five thousand, two hundred forty-nine".