636741121 has 2 divisors, whose sum is σ = 636741122. Its totient is φ = 636741120.

The previous prime is 636741071. The next prime is 636741143. The reversal of 636741121 is 121147636.

636741121 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., 589955521 + 46785600 = 24289^2 + 6840^2 .

It is a cyclic number.

It is not a de Polignac number, because 636741121 - 2⁹ = 636740609 is a prime.

It is a Chen prime.

It is equal to p_33139723 and since 636741121 and 33139723 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (636745121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318370560 + 318370561.

It is an arithmetic number, because the mean of its divisors is an integer number (318370561).

Almost surely, 2^636741121 is an apocalyptic number.

It is an amenable number.

636741121 is a deficient number, since it is larger than the sum of its proper divisors (1).

636741121 is an equidigital number, since it uses as much as digits as its factorization.

636741121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 636741121 is about 25233.7298273561. The cubic root of 636741121 is about 860.3086691711.

Adding to 636741121 its reverse (121147636), we get a palindrome (757888757).

The spelling of 636741121 in words is "six hundred thirty-six million, seven hundred forty-one thousand, one hundred twenty-one".