169861 has 4 divisors (see below), whose sum is σ = 172800. Its totient is φ = 166924.

The previous prime is 169859. The next prime is 169889. The reversal of 169861 is 168961.

It is a happy number.

169861 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 169861 - 2¹ = 169859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169831) 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, 1381 + ... + 1498.

It is an arithmetic number, because the mean of its divisors is an integer number (43200).

2¹⁶⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

169861 is a deficient number, since it is larger than the sum of its proper divisors (2939).

169861 is an equidigital number, since it uses as much as digits as its factorization.

169861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938.

The product of its digits is 2592, while the sum is 31.

The square root of 169861 is about 412.1419658322. The cubic root of 169861 is about 55.3814801664.

Subtracting from 169861 its reverse (168961), we obtain a square (900 = 30²).

The spelling of 169861 in words is "one hundred sixty-nine thousand, eight hundred sixty-one".