278122543 has 2 divisors, whose sum is σ = 278122544. Its totient is φ = 278122542.

The previous prime is 278122541. The next prime is 278122591. The reversal of 278122543 is 345221872.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278122543 - 2¹ = 278122541 is a prime.

Together with 278122541, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 278122499 and 278122508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278122541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139061271 + 139061272.

It is an arithmetic number, because the mean of its divisors is an integer number (139061272).

Almost surely, 2^278122543 is an apocalyptic number.

278122543 is a deficient number, since it is larger than the sum of its proper divisors (1).

278122543 is an equidigital number, since it uses as much as digits as its factorization.

278122543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 34.

The square root of 278122543 is about 16677.0064160208. The cubic root of 278122543 is about 652.7477706343.

The spelling of 278122543 in words is "two hundred seventy-eight million, one hundred twenty-two thousand, five hundred forty-three".