278822881 has 2 divisors, whose sum is σ = 278822882. Its totient is φ = 278822880.

The previous prime is 278822839. The next prime is 278822903. The reversal of 278822881 is 188228872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278723025 + 99856 = 16695^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 278822881 - 2²³ = 270434273 is a prime.

It is a super-2 number, since 2×278822881² = 155484397938280322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (278822801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139411440 + 139411441.

It is an arithmetic number, because the mean of its divisors is an integer number (139411441).

Almost surely, 2^278822881 is an apocalyptic number.

It is an amenable number.

278822881 is a deficient number, since it is larger than the sum of its proper divisors (1).

278822881 is an equidigital number, since it uses as much as digits as its factorization.

278822881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 229376, while the sum is 46.

The square root of 278822881 is about 16697.9903281802. The cubic root of 278822881 is about 653.2952042571.

The spelling of 278822881 in words is "two hundred seventy-eight million, eight hundred twenty-two thousand, eight hundred eighty-one".