385449661 has 2 divisors, whose sum is σ = 385449662. Its totient is φ = 385449660.

The previous prime is 385449613. The next prime is 385449671. The reversal of 385449661 is 166944583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377097561 + 8352100 = 19419^2 + 2890^2 .

It is a cyclic number.

It is not a de Polignac number, because 385449661 - 2⁹ = 385449149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385449671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192724830 + 192724831.

It is an arithmetic number, because the mean of its divisors is an integer number (192724831).

Almost surely, 2^385449661 is an apocalyptic number.

It is an amenable number.

385449661 is a deficient number, since it is larger than the sum of its proper divisors (1).

385449661 is an equidigital number, since it uses as much as digits as its factorization.

385449661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 46.

The square root of 385449661 is about 19632.8719498702. The cubic root of 385449661 is about 727.7617444031.

It can be divided in two parts, 38544 and 9661, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 385449661 in words is "three hundred eighty-five million, four hundred forty-nine thousand, six hundred sixty-one".