138869081 has 16 divisors (see below), whose sum is σ = 162859200. Its totient is φ = 117246528.

The previous prime is 138869077. The next prime is 138869083. The reversal of 138869081 is 180968831.

It is a happy number.

138869081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 138869081 - 2² = 138869077 is a prime.

It is a super-2 number, since 2×138869081² = 38569243315569122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138869083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2531 + ... + 16856.

It is an arithmetic number, because the mean of its divisors is an integer number (10178700).

Almost surely, 2^138869081 is an apocalyptic number.

It is an amenable number.

138869081 is a deficient number, since it is larger than the sum of its proper divisors (23990119).

138869081 is a wasteful number, since it uses less digits than its factorization.

138869081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19448.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 138869081 is about 11784.2726122574. The cubic root of 138869081 is about 517.8474640687.

The spelling of 138869081 in words is "one hundred thirty-eight million, eight hundred sixty-nine thousand, eighty-one".