135444161 has 4 divisors (see below), whose sum is σ = 139104852. Its totient is φ = 131783472.

The previous prime is 135444139. The next prime is 135444167. The reversal of 135444161 is 161444531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161444531 = 131 ⋅1232401.

It can be written as a sum of positive squares in 2 ways, for example, as 103408561 + 32035600 = 10169^2 + 5660^2 .

It is a cyclic number.

It is not a de Polignac number, because 135444161 - 2¹⁴ = 135427777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135444167) 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, 1830290 + ... + 1830363.

It is an arithmetic number, because the mean of its divisors is an integer number (34776213).

Almost surely, 2^135444161 is an apocalyptic number.

It is an amenable number.

135444161 is a deficient number, since it is larger than the sum of its proper divisors (3660691).

135444161 is an equidigital number, since it uses as much as digits as its factorization.

135444161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660690.

The product of its digits is 5760, while the sum is 29.

The square root of 135444161 is about 11638.0479892463. The cubic root of 135444161 is about 513.5547641523.

Adding to 135444161 its reverse (161444531), we get a palindrome (296888692).

The spelling of 135444161 in words is "one hundred thirty-five million, four hundred forty-four thousand, one hundred sixty-one".