636393493 has 2 divisors, whose sum is σ = 636393494. Its totient is φ = 636393492.

The previous prime is 636393449. The next prime is 636393503. The reversal of 636393493 is 394393636.

636393493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 574896529 + 61496964 = 23977^2 + 7842^2 .

It is a cyclic number.

It is not a de Polignac number, because 636393493 - 2¹³ = 636385301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636390493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318196746 + 318196747.

It is an arithmetic number, because the mean of its divisors is an integer number (318196747).

Almost surely, 2^636393493 is an apocalyptic number.

It is an amenable number.

636393493 is a deficient number, since it is larger than the sum of its proper divisors (1).

636393493 is an equidigital number, since it uses as much as digits as its factorization.

636393493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 46.

The square root of 636393493 is about 25226.8407257032. The cubic root of 636393493 is about 860.1520791987.

It can be divided in two parts, 6363 and 93493, that added together give a square (99856 = 316²).

The spelling of 636393493 in words is "six hundred thirty-six million, three hundred ninety-three thousand, four hundred ninety-three".