278488061 has 2 divisors, whose sum is σ = 278488062. Its totient is φ = 278488060.

The previous prime is 278488051. The next prime is 278488127. The reversal of 278488061 is 160884872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231222436 + 47265625 = 15206^2 + 6875^2 .

It is a cyclic number.

It is not a de Polignac number, because 278488061 - 2²² = 274293757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278488051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139244030 + 139244031.

It is an arithmetic number, because the mean of its divisors is an integer number (139244031).

Almost surely, 2^278488061 is an apocalyptic number.

It is an amenable number.

278488061 is a deficient number, since it is larger than the sum of its proper divisors (1).

278488061 is an equidigital number, since it uses as much as digits as its factorization.

278488061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172032, while the sum is 44.

The square root of 278488061 is about 16687.9615591599. The cubic root of 278488061 is about 653.0335998133.

The spelling of 278488061 in words is "two hundred seventy-eight million, four hundred eighty-eight thousand, sixty-one".