636330433 has 4 divisors (see below), whose sum is σ = 637748100. Its totient is φ = 634912768.

The previous prime is 636330427. The next prime is 636330437. The reversal of 636330433 is 334033636.

It is a happy number.

636330433 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 436475664 + 199854769 = 20892^2 + 14137^2 .

It is a cyclic number.

It is not a de Polignac number, because 636330433 - 2⁹ = 636329921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 636330395 and 636330404.

It is not an unprimeable number, because it can be changed into a prime (636330437) 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, 708160 + ... + 709057.

It is an arithmetic number, because the mean of its divisors is an integer number (159437025).

Almost surely, 2^636330433 is an apocalyptic number.

It is an amenable number.

636330433 is a deficient number, since it is larger than the sum of its proper divisors (1417667).

636330433 is a wasteful number, since it uses less digits than its factorization.

636330433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417666.

The product of its (nonzero) digits is 34992, while the sum is 31.

The square root of 636330433 is about 25225.5908354988. The cubic root of 636330433 is about 860.1236675412.

The spelling of 636330433 in words is "six hundred thirty-six million, three hundred thirty thousand, four hundred thirty-three".