161893 has 4 divisors (see below), whose sum is σ = 163660. Its totient is φ = 160128.

The previous prime is 161881. The next prime is 161911. The reversal of 161893 is 398161.

It is a happy number.

161893 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 an emirpimes, since its reverse is a distinct semiprime: 398161 = 631².

It can be written as a sum of positive squares in 2 ways, for example, as 79524 + 82369 = 282^2 + 287^2 .

It is a cyclic number.

It is not a de Polignac number, because 161893 - 2¹³ = 153701 is a prime.

It is a Duffinian number.

161893 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161873) 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, 738 + ... + 931.

It is an arithmetic number, because the mean of its divisors is an integer number (40915).

2¹⁶¹⁸⁹³ is an apocalyptic number.

It is an amenable number.

161893 is a deficient number, since it is larger than the sum of its proper divisors (1767).

161893 is an equidigital number, since it uses as much as digits as its factorization.

161893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1766.

The product of its digits is 1296, while the sum is 28.

The square root of 161893 is about 402.3592921755. The cubic root of 161893 is about 54.5016131722.

It can be divided in two parts, 1618 and 93, that added together give a triangular number (1711 = T₅₈).

The spelling of 161893 in words is "one hundred sixty-one thousand, eight hundred ninety-three".