278611559 has 2 divisors, whose sum is σ = 278611560. Its totient is φ = 278611558.

The previous prime is 278611549. The next prime is 278611561. The reversal of 278611559 is 955116872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278611559 - 2¹² = 278607463 is a prime.

Together with 278611561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278611549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139305779 + 139305780.

It is an arithmetic number, because the mean of its divisors is an integer number (139305780).

Almost surely, 2^278611559 is an apocalyptic number.

278611559 is a deficient number, since it is larger than the sum of its proper divisors (1).

278611559 is an equidigital number, since it uses as much as digits as its factorization.

278611559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 44.

The square root of 278611559 is about 16691.6613612906. The cubic root of 278611559 is about 653.1301167277.

The spelling of 278611559 in words is "two hundred seventy-eight million, six hundred eleven thousand, five hundred fifty-nine".