272161 has 4 divisors (see below), whose sum is σ = 274432. Its totient is φ = 269892.

The previous prime is 272141. The next prime is 272171. The reversal of 272161 is 161272.

272161 is nontrivially palindromic in base 2.

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 a de Polignac number, because none of the positive numbers 2^k-272161 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (272131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 945 + ... + 1198.

It is an arithmetic number, because the mean of its divisors is an integer number (68608).

2²⁷²¹⁶¹ is an apocalyptic number.

It is an amenable number.

272161 is a deficient number, since it is larger than the sum of its proper divisors (2271).

272161 is a wasteful number, since it uses less digits than its factorization.

272161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270.

The product of its digits is 168, while the sum is 19.

The square root of 272161 is about 521.6905212863. The cubic root of 272161 is about 64.8050172663.

Subtracting from 272161 its reverse (161272), we obtain a square (110889 = 333²).

The spelling of 272161 in words is "two hundred seventy-two thousand, one hundred sixty-one".