636329812121 has 2 divisors, whose sum is σ = 636329812122. Its totient is φ = 636329812120.

The previous prime is 636329812103. The next prime is 636329812141. The reversal of 636329812121 is 121218923636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635470442896 + 859369225 = 797164^2 + 29315^2 .

It is a cyclic number.

It is not a de Polignac number, because 636329812121 - 2²⁶ = 636262703257 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (636329812141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318164906060 + 318164906061.

It is an arithmetic number, because the mean of its divisors is an integer number (318164906061).

Almost surely, 2^636329812121 is an apocalyptic number.

It is an amenable number.

636329812121 is a deficient number, since it is larger than the sum of its proper divisors (1).

636329812121 is an equidigital number, since it uses as much as digits as its factorization.

636329812121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The spelling of 636329812121 in words is "six hundred thirty-six billion, three hundred twenty-nine million, eight hundred twelve thousand, one hundred twenty-one".