395491549 has 2 divisors, whose sum is σ = 395491550. Its totient is φ = 395491548.

The previous prime is 395491543. The next prime is 395491643. The reversal of 395491549 is 945194593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255424324 + 140067225 = 15982^2 + 11835^2 .

It is a cyclic number.

It is not a de Polignac number, because 395491549 - 2⁹ = 395491037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395491543) 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, 197745774 + 197745775.

It is an arithmetic number, because the mean of its divisors is an integer number (197745775).

Almost surely, 2^395491549 is an apocalyptic number.

It is an amenable number.

395491549 is a deficient number, since it is larger than the sum of its proper divisors (1).

395491549 is an equidigital number, since it uses as much as digits as its factorization.

395491549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 49.

The square root of 395491549 is about 19886.9693266722. The cubic root of 395491549 is about 734.0276212361.

The spelling of 395491549 in words is "three hundred ninety-five million, four hundred ninety-one thousand, five hundred forty-nine".