636024121 has 2 divisors, whose sum is σ = 636024122. Its totient is φ = 636024120.

The previous prime is 636024119. The next prime is 636024127. The reversal of 636024121 is 121420636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 614494521 + 21529600 = 24789^2 + 4640^2 .

It is a cyclic number.

It is not a de Polignac number, because 636024121 - 2¹ = 636024119 is a prime.

Together with 636024119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (636024127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318012060 + 318012061.

It is an arithmetic number, because the mean of its divisors is an integer number (318012061).

Almost surely, 2^636024121 is an apocalyptic number.

It is an amenable number.

636024121 is a deficient number, since it is larger than the sum of its proper divisors (1).

636024121 is an equidigital number, since it uses as much as digits as its factorization.

636024121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 636024121 is about 25219.5186512352. The cubic root of 636024121 is about 859.9856320837.

Adding to 636024121 its reverse (121420636), we get a palindrome (757444757).

The spelling of 636024121 in words is "six hundred thirty-six million, twenty-four thousand, one hundred twenty-one".