138081 has 4 divisors (see below), whose sum is σ = 184112. Its totient is φ = 92052.

The previous prime is 138079. The next prime is 138101. The reversal of 138081 is 180831.

It is a happy number.

138081 is nontrivially palindromic in base 2.

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 not a de Polignac number, because 138081 - 2¹ = 138079 is a prime.

It is a super-2 number, since 2×138081² = 38132725122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

138081 is a lucky number.

It is a plaindrome in base 7.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (138041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23011 + ... + 23016.

It is an arithmetic number, because the mean of its divisors is an integer number (46028).

2¹³⁸⁰⁸¹ is an apocalyptic number.

It is an amenable number.

138081 is a deficient number, since it is larger than the sum of its proper divisors (46031).

138081 is an equidigital number, since it uses as much as digits as its factorization.

138081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46030.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 138081 is about 371.5925187622. The cubic root of 138081 is about 51.6866011642.

The spelling of 138081 in words is "one hundred thirty-eight thousand, eighty-one".