278341979 has 2 divisors, whose sum is σ = 278341980. Its totient is φ = 278341978.

The previous prime is 278341937. The next prime is 278341997. The reversal of 278341979 is 979143872.

Together with next prime (278341997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278341979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (278343979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139170989 + 139170990.

It is an arithmetic number, because the mean of its divisors is an integer number (139170990).

Almost surely, 2^278341979 is an apocalyptic number.

278341979 is a deficient number, since it is larger than the sum of its proper divisors (1).

278341979 is an equidigital number, since it uses as much as digits as its factorization.

278341979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 278341979 is about 16683.5841173292. The cubic root of 278341979 is about 652.9193960672.

The spelling of 278341979 in words is "two hundred seventy-eight million, three hundred forty-one thousand, nine hundred seventy-nine".