135211161 has 4 divisors (see below), whose sum is σ = 180281552. Its totient is φ = 90140772.

The previous prime is 135211133. The next prime is 135211169. The reversal of 135211161 is 161112531.

It is a happy number.

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: 161112531 = 3 ⋅53704177.

It is not a de Polignac number, because 135211161 - 2⁷ = 135211033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135211169) 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, 22535191 + ... + 22535196.

It is an arithmetic number, because the mean of its divisors is an integer number (45070388).

Almost surely, 2^135211161 is an apocalyptic number.

It is an amenable number.

135211161 is a deficient number, since it is larger than the sum of its proper divisors (45070391).

135211161 is an equidigital number, since it uses as much as digits as its factorization.

135211161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45070390.

The product of its digits is 180, while the sum is 21.

The square root of 135211161 is about 11628.0334106847. The cubic root of 135211161 is about 513.2601115085.

Adding to 135211161 its reverse (161112531), we get a palindrome (296323692).

The spelling of 135211161 in words is "one hundred thirty-five million, two hundred eleven thousand, one hundred sixty-one".