138281189 has 2 divisors, whose sum is σ = 138281190. Its totient is φ = 138281188.

The previous prime is 138281161. The next prime is 138281201. The reversal of 138281189 is 981182831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138250564 + 30625 = 11758^2 + 175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138281189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138281389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69140594 + 69140595.

It is an arithmetic number, because the mean of its divisors is an integer number (69140595).

Almost surely, 2^138281189 is an apocalyptic number.

It is an amenable number.

138281189 is a deficient number, since it is larger than the sum of its proper divisors (1).

138281189 is an equidigital number, since it uses as much as digits as its factorization.

138281189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 41.

The square root of 138281189 is about 11759.3022327007. The cubic root of 138281189 is about 517.1156741022.

The spelling of 138281189 in words is "one hundred thirty-eight million, two hundred eighty-one thousand, one hundred eighty-nine".