16161 has 4 divisors (see below), whose sum is σ = 21552. Its totient is φ = 10772.

The previous prime is 16141. The next prime is 16183.

16161 is nontrivially palindromic in base 10.

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.

It is a cyclic number.

It is not a de Polignac number, because 16161 - 2⁶ = 16097 is a prime.

It is a super-2 number, since 2×16161² = 522355842, which contains 22 as substring.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

16161 is an undulating number in base 10.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16161.

It is not an unprimeable number, because it can be changed into a prime (16111) 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, 2691 + ... + 2696.

It is an arithmetic number, because the mean of its divisors is an integer number (5388).

2¹⁶¹⁶¹ is an apocalyptic number.

It is an amenable number.

16161 is a deficient number, since it is larger than the sum of its proper divisors (5391).

16161 is an equidigital number, since it uses as much as digits as its factorization.

16161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5390.

The product of its digits is 36, while the sum is 15.

The square root of 16161 is about 127.1259218256. The cubic root of 16161 is about 25.2826587827.

It can be divided in two parts, 161 and 61, that added together give a palindrome (222).

The spelling of 16161 in words is "sixteen thousand, one hundred sixty-one".