138173611 has 2 divisors, whose sum is σ = 138173612. Its totient is φ = 138173610.

The previous prime is 138173593. The next prime is 138173621. The reversal of 138173611 is 116371831.

138173611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138173611 - 2²¹ = 136076459 is a prime.

It is not a weakly prime, because it can be changed into another prime (138173621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69086805 + 69086806.

It is an arithmetic number, because the mean of its divisors is an integer number (69086806).

Almost surely, 2^138173611 is an apocalyptic number.

138173611 is a deficient number, since it is larger than the sum of its proper divisors (1).

138173611 is an equidigital number, since it uses as much as digits as its factorization.

138173611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 138173611 is about 11754.7271767574. The cubic root of 138173611 is about 516.9815399205.

The spelling of 138173611 in words is "one hundred thirty-eight million, one hundred seventy-three thousand, six hundred eleven".