278553641 has 2 divisors, whose sum is σ = 278553642. Its totient is φ = 278553640.

The previous prime is 278553607. The next prime is 278553643. The reversal of 278553641 is 146355872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144480400 + 134073241 = 12020^2 + 11579^2 .

It is a cyclic number.

It is not a de Polignac number, because 278553641 - 2²⁶ = 211444777 is a prime.

It is a Sophie Germain prime.

Together with 278553643, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (278553643) 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, 139276820 + 139276821.

It is an arithmetic number, because the mean of its divisors is an integer number (139276821).

Almost surely, 2^278553641 is an apocalyptic number.

It is an amenable number.

278553641 is a deficient number, since it is larger than the sum of its proper divisors (1).

278553641 is an equidigital number, since it uses as much as digits as its factorization.

278553641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 41.

The square root of 278553641 is about 16689.9263329710. The cubic root of 278553641 is about 653.0848558493.

The spelling of 278553641 in words is "two hundred seventy-eight million, five hundred fifty-three thousand, six hundred forty-one".