636471361 has 2 divisors, whose sum is σ = 636471362. Its totient is φ = 636471360.

The previous prime is 636471359. The next prime is 636471389. The reversal of 636471361 is 163174636.

It is a happy number.

636471361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 577488961 + 58982400 = 24031^2 + 7680^2 .

It is a cyclic number.

It is not a de Polignac number, because 636471361 - 2¹ = 636471359 is a prime.

Together with 636471359, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 636471361.

It is not a weakly prime, because it can be changed into another prime (636471461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318235680 + 318235681.

It is an arithmetic number, because the mean of its divisors is an integer number (318235681).

Almost surely, 2^636471361 is an apocalyptic number.

It is an amenable number.

636471361 is a deficient number, since it is larger than the sum of its proper divisors (1).

636471361 is an equidigital number, since it uses as much as digits as its factorization.

636471361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 37.

The square root of 636471361 is about 25228.3840346543. The cubic root of 636471361 is about 860.1871600049.

The spelling of 636471361 in words is "six hundred thirty-six million, four hundred seventy-one thousand, three hundred sixty-one".