209127631231289 has 2 divisors, whose sum is σ = 209127631231290. Its totient is φ = 209127631231288.

The previous prime is 209127631231241. The next prime is 209127631231411. The reversal of 209127631231289 is 982132136721902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161521426155664 + 47606205075625 = 12709108^2 + 6899725^2 .

It is a cyclic number.

It is not a de Polignac number, because 209127631231289 - 2²⁸ = 209127362795833 is a prime.

It is a super-2 number, since 2×209127631231289² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209127631231219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104563815615644 + 104563815615645.

It is an arithmetic number, because the mean of its divisors is an integer number (104563815615645).

Almost surely, 2^{209127631231289} is an apocalyptic number.

It is an amenable number.

209127631231289 is a deficient number, since it is larger than the sum of its proper divisors (1).

209127631231289 is an equidigital number, since it uses as much as digits as its factorization.

209127631231289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 209127631231289 in words is "two hundred nine trillion, one hundred twenty-seven billion, six hundred thirty-one million, two hundred thirty-one thousand, two hundred eighty-nine".