138175637 has 2 divisors, whose sum is σ = 138175638. Its totient is φ = 138175636.

The previous prime is 138175613. The next prime is 138175753. The reversal of 138175637 is 736571831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135466321 + 2709316 = 11639^2 + 1646^2 .

It is a cyclic number.

It is not a de Polignac number, because 138175637 - 2¹⁴ = 138159253 is a prime.

It is equal to p_7814849 and since 138175637 and 7814849 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 138175594 and 138175603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138175607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69087818 + 69087819.

It is an arithmetic number, because the mean of its divisors is an integer number (69087819).

Almost surely, 2^138175637 is an apocalyptic number.

It is an amenable number.

138175637 is a deficient number, since it is larger than the sum of its proper divisors (1).

138175637 is an equidigital number, since it uses as much as digits as its factorization.

138175637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The square root of 138175637 is about 11754.8133545369. The cubic root of 138175637 is about 516.9840666922.

The spelling of 138175637 in words is "one hundred thirty-eight million, one hundred seventy-five thousand, six hundred thirty-seven".