138171589 has 2 divisors, whose sum is σ = 138171590. Its totient is φ = 138171588.

The previous prime is 138171571. The next prime is 138171641. The reversal of 138171589 is 985171831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137874564 + 297025 = 11742^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 138171589 - 2¹¹ = 138169541 is a prime.

It is a super-4 number, since 4×138171589⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138171559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69085794 + 69085795.

It is an arithmetic number, because the mean of its divisors is an integer number (69085795).

Almost surely, 2^138171589 is an apocalyptic number.

It is an amenable number.

138171589 is a deficient number, since it is larger than the sum of its proper divisors (1).

138171589 is an equidigital number, since it uses as much as digits as its factorization.

138171589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 43.

The square root of 138171589 is about 11754.6411684917. The cubic root of 138171589 is about 516.9790181130.

The spelling of 138171589 in words is "one hundred thirty-eight million, one hundred seventy-one thousand, five hundred eighty-nine".