278878553 has 2 divisors, whose sum is σ = 278878554. Its totient is φ = 278878552.

The previous prime is 278878541. The next prime is 278878609. The reversal of 278878553 is 355878872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220463104 + 58415449 = 14848^2 + 7643^2 .

It is a cyclic number.

It is not a de Polignac number, because 278878553 - 2²⁶ = 211769689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 278878495 and 278878504.

It is not a weakly prime, because it can be changed into another prime (278878253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139439276 + 139439277.

It is an arithmetic number, because the mean of its divisors is an integer number (139439277).

Almost surely, 2^278878553 is an apocalyptic number.

It is an amenable number.

278878553 is a deficient number, since it is larger than the sum of its proper divisors (1).

278878553 is an equidigital number, since it uses as much as digits as its factorization.

278878553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3763200, while the sum is 53.

The square root of 278878553 is about 16699.6572719323. The cubic root of 278878553 is about 653.3386820736.

The spelling of 278878553 in words is "two hundred seventy-eight million, eight hundred seventy-eight thousand, five hundred fifty-three".