168621 has 4 divisors (see below), whose sum is σ = 224832. Its totient is φ = 112412.

The previous prime is 168617. The next prime is 168629. The reversal of 168621 is 126861.

168621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 168621 - 2² = 168617 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 168591 and 168600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168629) 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, 28101 + ... + 28106.

It is an arithmetic number, because the mean of its divisors is an integer number (56208).

2¹⁶⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

168621 is a deficient number, since it is larger than the sum of its proper divisors (56211).

168621 is an equidigital number, since it uses as much as digits as its factorization.

168621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56210.

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

The square root of 168621 is about 410.6348743105. The cubic root of 168621 is about 55.2463877029.

The spelling of 168621 in words is "one hundred sixty-eight thousand, six hundred twenty-one".