636882881 has 2 divisors, whose sum is σ = 636882882. Its totient is φ = 636882880.

The previous prime is 636882877. The next prime is 636882893. The reversal of 636882881 is 188288636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400000000 + 236882881 = 20000^2 + 15391^2 .

It is a cyclic number.

It is not a de Polignac number, because 636882881 - 2² = 636882877 is a prime.

It is a super-2 number, since 2×636882881² = 811239608221720322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (636885881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318441440 + 318441441.

It is an arithmetic number, because the mean of its divisors is an integer number (318441441).

Almost surely, 2^636882881 is an apocalyptic number.

It is an amenable number.

636882881 is a deficient number, since it is larger than the sum of its proper divisors (1).

636882881 is an equidigital number, since it uses as much as digits as its factorization.

636882881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 884736, while the sum is 50.

The square root of 636882881 is about 25236.5386097222. The cubic root of 636882881 is about 860.3725089868.

The spelling of 636882881 in words is "six hundred thirty-six million, eight hundred eighty-two thousand, eight hundred eighty-one".