138107081 has 4 divisors (see below), whose sum is σ = 157836672. Its totient is φ = 118377492.

The previous prime is 138107071. The next prime is 138107093. The reversal of 138107081 is 180701831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138107081 is a prime.

It is a super-2 number, since 2×138107081² = 38147131644681122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138107071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9864785 + ... + 9864798.

It is an arithmetic number, because the mean of its divisors is an integer number (39459168).

Almost surely, 2^138107081 is an apocalyptic number.

It is an amenable number.

138107081 is a deficient number, since it is larger than the sum of its proper divisors (19729591).

138107081 is an equidigital number, since it uses as much as digits as its factorization.

138107081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19729590.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 138107081 is about 11751.8969107119. The cubic root of 138107081 is about 516.8985518029.

The spelling of 138107081 in words is "one hundred thirty-eight million, one hundred seven thousand, eighty-one".