395303561 has 2 divisors, whose sum is σ = 395303562. Its totient is φ = 395303560.

The previous prime is 395303539. The next prime is 395303563. The reversal of 395303561 is 165303593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390655225 + 4648336 = 19765^2 + 2156^2 .

It is a cyclic number.

It is not a de Polignac number, because 395303561 - 2⁶ = 395303497 is a prime.

It is a Sophie Germain prime.

Together with 395303563, 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 (395303563) 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, 197651780 + 197651781.

It is an arithmetic number, because the mean of its divisors is an integer number (197651781).

Almost surely, 2^395303561 is an apocalyptic number.

It is an amenable number.

395303561 is a deficient number, since it is larger than the sum of its proper divisors (1).

395303561 is an equidigital number, since it uses as much as digits as its factorization.

395303561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 35.

The square root of 395303561 is about 19882.2423534168. The cubic root of 395303561 is about 733.9113016385.

The spelling of 395303561 in words is "three hundred ninety-five million, three hundred three thousand, five hundred sixty-one".