636849133 has 2 divisors, whose sum is σ = 636849134. Its totient is φ = 636849132.

The previous prime is 636849119. The next prime is 636849149. The reversal of 636849133 is 331948636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599907049 + 36942084 = 24493^2 + 6078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636849133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 636849133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636849533) 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, 318424566 + 318424567.

It is an arithmetic number, because the mean of its divisors is an integer number (318424567).

Almost surely, 2^636849133 is an apocalyptic number.

It is an amenable number.

636849133 is a deficient number, since it is larger than the sum of its proper divisors (1).

636849133 is an equidigital number, since it uses as much as digits as its factorization.

636849133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 43.

The square root of 636849133 is about 25235.8699671717. The cubic root of 636849133 is about 860.3573118628.

The spelling of 636849133 in words is "six hundred thirty-six million, eight hundred forty-nine thousand, one hundred thirty-three".