138861285289 has 2 divisors, whose sum is σ = 138861285290. Its totient is φ = 138861285288.

The previous prime is 138861285287. The next prime is 138861285341. The reversal of 138861285289 is 982582168831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101917370025 + 36943915264 = 319245^2 + 192208^2 .

It is a cyclic number.

It is not a de Polignac number, because 138861285289 - 2¹ = 138861285287 is a prime.

It is a super-2 number, since 2×138861285289² (a number of 23 digits) contains 22 as substring.

Together with 138861285287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (138861285287) 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, 69430642644 + 69430642645.

It is an arithmetic number, because the mean of its divisors is an integer number (69430642645).

Almost surely, 2^138861285289 is an apocalyptic number.

It is an amenable number.

138861285289 is a deficient number, since it is larger than the sum of its proper divisors (1).

138861285289 is an equidigital number, since it uses as much as digits as its factorization.

138861285289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13271040, while the sum is 61.

The spelling of 138861285289 in words is "one hundred thirty-eight billion, eight hundred sixty-one million, two hundred eighty-five thousand, two hundred eighty-nine".