278865253 has 2 divisors, whose sum is σ = 278865254. Its totient is φ = 278865252.

The previous prime is 278865199. The next prime is 278865259. The reversal of 278865253 is 352568872.

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., 190937124 + 87928129 = 13818^2 + 9377^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278865253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278865259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139432626 + 139432627.

It is an arithmetic number, because the mean of its divisors is an integer number (139432627).

Almost surely, 2^278865253 is an apocalyptic number.

It is an amenable number.

278865253 is a deficient number, since it is larger than the sum of its proper divisors (1).

278865253 is an equidigital number, since it uses as much as digits as its factorization.

278865253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 46.

The square root of 278865253 is about 16699.2590554192. The cubic root of 278865253 is about 653.3282957812.

The spelling of 278865253 in words is "two hundred seventy-eight million, eight hundred sixty-five thousand, two hundred fifty-three".