278990441 has 2 divisors, whose sum is σ = 278990442. Its totient is φ = 278990440.

The previous prime is 278990389. The next prime is 278990443. The reversal of 278990441 is 144099872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141514816 + 137475625 = 11896^2 + 11725^2 .

It is a cyclic number.

It is not a de Polignac number, because 278990441 - 2¹⁴ = 278974057 is a prime.

It is a Sophie Germain prime.

Together with 278990443, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 278990392 and 278990401.

It is not a weakly prime, because it can be changed into another prime (278990443) 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, 139495220 + 139495221.

It is an arithmetic number, because the mean of its divisors is an integer number (139495221).

Almost surely, 2^278990441 is an apocalyptic number.

It is an amenable number.

278990441 is a deficient number, since it is larger than the sum of its proper divisors (1).

278990441 is an equidigital number, since it uses as much as digits as its factorization.

278990441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 278990441 is about 16703.0069448588. The cubic root of 278990441 is about 653.4260450538.

The spelling of 278990441 in words is "two hundred seventy-eight million, nine hundred ninety thousand, four hundred forty-one".