168551 has 4 divisors (see below), whose sum is σ = 172704. Its totient is φ = 164400.

The previous prime is 168541. The next prime is 168559. The reversal of 168551 is 155861.

168551 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168559) 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, 2015 + ... + 2096.

It is an arithmetic number, because the mean of its divisors is an integer number (43176).

2¹⁶⁸⁵⁵¹ is an apocalyptic number.

168551 is a deficient number, since it is larger than the sum of its proper divisors (4153).

168551 is an equidigital number, since it uses as much as digits as its factorization.

168551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4152.

The product of its digits is 1200, while the sum is 26.

The square root of 168551 is about 410.5496315916. The cubic root of 168551 is about 55.2387417940.

The spelling of 168551 in words is "one hundred sixty-eight thousand, five hundred fifty-one".