161138 has 16 divisors (see below), whose sum is σ = 262656. Its totient is φ = 73920.

The previous prime is 161137. The next prime is 161141. The reversal of 161138 is 831161.

161138 is nontrivially palindromic in base 16.

It is not an unprimeable number, because it can be changed into a prime (161137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1370 + ... + 1482.

It is an arithmetic number, because the mean of its divisors is an integer number (16416).

2¹⁶¹¹³⁸ is an apocalyptic number.

161138 is a deficient number, since it is larger than the sum of its proper divisors (101518).

161138 is a wasteful number, since it uses less digits than its factorization.

161138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169.

The product of its digits is 144, while the sum is 20.

The square root of 161138 is about 401.4199795725. The cubic root of 161138 is about 54.4167570206.

Adding to 161138 its reverse (831161), we get a palindrome (992299).

The spelling of 161138 in words is "one hundred sixty-one thousand, one hundred thirty-eight".