161135121 has 32 divisors (see below), whose sum is σ = 250306560. Its totient is φ = 90307584.

The previous prime is 161135101. The next prime is 161135173. The reversal of 161135121 is 121531161.

It is a happy number.

It is not a de Polignac number, because 161135121 - 2⁵ = 161135089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (161135101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 336160 + ... + 336638.

It is an arithmetic number, because the mean of its divisors is an integer number (7822080).

Almost surely, 2^161135121 is an apocalyptic number.

It is an amenable number.

161135121 is a deficient number, since it is larger than the sum of its proper divisors (89171439).

161135121 is a wasteful number, since it uses less digits than its factorization.

161135121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765.

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

The square root of 161135121 is about 12693.9009370642. The cubic root of 161135121 is about 544.1643293649.

Adding to 161135121 its reverse (121531161), we get a palindrome (282666282).

The spelling of 161135121 in words is "one hundred sixty-one million, one hundred thirty-five thousand, one hundred twenty-one".