278920259 has 2 divisors, whose sum is σ = 278920260. Its totient is φ = 278920258.

The previous prime is 278920219. The next prime is 278920261. The reversal of 278920259 is 952029872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278920259 - 2¹² = 278916163 is a prime.

Together with 278920261, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (278920219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139460129 + 139460130.

It is an arithmetic number, because the mean of its divisors is an integer number (139460130).

Almost surely, 2^278920259 is an apocalyptic number.

278920259 is a deficient number, since it is larger than the sum of its proper divisors (1).

278920259 is an equidigital number, since it uses as much as digits as its factorization.

278920259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 278920259 is about 16700.9059335115. The cubic root of 278920259 is about 653.3712491589.

The spelling of 278920259 in words is "two hundred seventy-eight million, nine hundred twenty thousand, two hundred fifty-nine".