278497 has 2 divisors, whose sum is σ = 278498. Its totient is φ = 278496.

The previous prime is 278491. The next prime is 278501. The reversal of 278497 is 794872.

It is a happy number.

278497 is nontrivially palindromic in base 2.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271441 + 7056 = 521^2 + 84^2 .

It is a cyclic number.

It is not a de Polignac number, because 278497 - 2³ = 278489 is a prime.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is not a weakly prime, because it can be changed into another prime (278491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139248 + 139249.

It is an arithmetic number, because the mean of its divisors is an integer number (139249).

2²⁷⁸⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

278497 is a deficient number, since it is larger than the sum of its proper divisors (1).

278497 is an equidigital number, since it uses as much as digits as its factorization.

278497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 37.

The square root of 278497 is about 527.7281497135. The cubic root of 278497 is about 65.3040586833.

The spelling of 278497 in words is "two hundred seventy-eight thousand, four hundred ninety-seven".