138170537 has 4 divisors (see below), whose sum is σ = 138200580. Its totient is φ = 138140496.

The previous prime is 138170497. The next prime is 138170561. The reversal of 138170537 is 735071831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 735071831 = 13 ⋅56543987.

It can be written as a sum of positive squares in 2 ways, for example, as 38390416 + 99780121 = 6196^2 + 9989^2 .

It is a cyclic number.

It is not a de Polignac number, because 138170537 - 2¹⁴ = 138154153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138170497 and 138170506.

It is not an unprimeable number, because it can be changed into a prime (138170597) 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 in 3 ways as a sum of consecutive naturals, for example, 6518 + ... + 17855.

It is an arithmetic number, because the mean of its divisors is an integer number (34550145).

Almost surely, 2^138170537 is an apocalyptic number.

It is an amenable number.

138170537 is a deficient number, since it is larger than the sum of its proper divisors (30043).

138170537 is an equidigital number, since it uses as much as digits as its factorization.

138170537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30042.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 138170537 is about 11754.5964201243. The cubic root of 138170537 is about 516.9777060649.

The spelling of 138170537 in words is "one hundred thirty-eight million, one hundred seventy thousand, five hundred thirty-seven".