636393449 has 2 divisors, whose sum is σ = 636393450. Its totient is φ = 636393448.

The previous prime is 636393409. The next prime is 636393493. The reversal of 636393449 is 944393636.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627151849 + 9241600 = 25043^2 + 3040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636393449 is a prime.

It is not a weakly prime, because it can be changed into another prime (636393409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318196724 + 318196725.

It is an arithmetic number, because the mean of its divisors is an integer number (318196725).

Almost surely, 2^636393449 is an apocalyptic number.

It is an amenable number.

636393449 is a deficient number, since it is larger than the sum of its proper divisors (1).

636393449 is an equidigital number, since it uses as much as digits as its factorization.

636393449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 47.

The square root of 636393449 is about 25226.8398536162. The cubic root of 636393449 is about 860.1520593752.

The spelling of 636393449 in words is "six hundred thirty-six million, three hundred ninety-three thousand, four hundred forty-nine".