631636112281 has 2 divisors, whose sum is σ = 631636112282. Its totient is φ = 631636112280.

The previous prime is 631636112279. The next prime is 631636112363. The reversal of 631636112281 is 182211636136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 500924217600 + 130711894681 = 707760^2 + 361541^2 .

It is a cyclic number.

It is not a de Polignac number, because 631636112281 - 2¹ = 631636112279 is a prime.

It is a super-3 number, since 3×631636112281³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 631636112279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (631636112201) 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, 315818056140 + 315818056141.

It is an arithmetic number, because the mean of its divisors is an integer number (315818056141).

Almost surely, 2^631636112281 is an apocalyptic number.

It is an amenable number.

631636112281 is a deficient number, since it is larger than the sum of its proper divisors (1).

631636112281 is an equidigital number, since it uses as much as digits as its factorization.

631636112281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The spelling of 631636112281 in words is "six hundred thirty-one billion, six hundred thirty-six million, one hundred twelve thousand, two hundred eighty-one".