636393497 has 4 divisors (see below), whose sum is σ = 638029860. Its totient is φ = 634757136.

The previous prime is 636393493. The next prime is 636393503. The reversal of 636393497 is 794393636.

It is a happy number.

636393497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 378341401 + 258052096 = 19451^2 + 16064^2 .

It is a cyclic number.

It is not a de Polignac number, because 636393497 - 2² = 636393493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636393493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817598 + ... + 818375.

It is an arithmetic number, because the mean of its divisors is an integer number (159507465).

Almost surely, 2^636393497 is an apocalyptic number.

It is an amenable number.

636393497 is a deficient number, since it is larger than the sum of its proper divisors (1636363).

636393497 is a wasteful number, since it uses less digits than its factorization.

636393497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636362.

The product of its digits is 2204496, while the sum is 50.

The square root of 636393497 is about 25226.8408049839. The cubic root of 636393497 is about 860.1520810008.

The spelling of 636393497 in words is "six hundred thirty-six million, three hundred ninety-three thousand, four hundred ninety-seven".