138144161 has 4 divisors (see below), whose sum is σ = 138202800. Its totient is φ = 138085524.

The previous prime is 138144157. The next prime is 138144191. The reversal of 138144161 is 161441831.

138144161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 161441831 = 31 ⋅5207801.

It is a cyclic number.

It is not a de Polignac number, because 138144161 - 2² = 138144157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138144101) 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, 25631 + ... + 30548.

It is an arithmetic number, because the mean of its divisors is an integer number (34550700).

Almost surely, 2^138144161 is an apocalyptic number.

It is an amenable number.

138144161 is a deficient number, since it is larger than the sum of its proper divisors (58639).

138144161 is an equidigital number, since it uses as much as digits as its factorization.

138144161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58638.

The product of its digits is 2304, while the sum is 29.

The square root of 138144161 is about 11753.4744224846. The cubic root of 138144161 is about 516.9448078990.

Adding to 138144161 its reverse (161441831), we get a palindrome (299585992).

The spelling of 138144161 in words is "one hundred thirty-eight million, one hundred forty-four thousand, one hundred sixty-one".