168261 has 4 divisors (see below), whose sum is σ = 224352. Its totient is φ = 112172.

The previous prime is 168253. The next prime is 168263. The reversal of 168261 is 162861.

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: 162861 = 3 ⋅54287.

It is a cyclic number.

It is not a de Polignac number, because 168261 - 2³ = 168253 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168263) 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, 28041 + ... + 28046.

It is an arithmetic number, because the mean of its divisors is an integer number (56088).

2¹⁶⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

168261 is a deficient number, since it is larger than the sum of its proper divisors (56091).

168261 is an equidigital number, since it uses as much as digits as its factorization.

168261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56090.

The product of its digits is 576, while the sum is 24.

The square root of 168261 is about 410.1962944738. The cubic root of 168261 is about 55.2070433147.

The spelling of 168261 in words is "one hundred sixty-eight thousand, two hundred sixty-one".