203161 has 4 divisors (see below), whose sum is σ = 232192. Its totient is φ = 174132.

The previous prime is 203141. The next prime is 203173. The reversal of 203161 is 161302.

203161 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, and also an emirpimes, since its reverse is a distinct semiprime: 161302 = 2 ⋅80651.

It is not a de Polignac number, because 203161 - 2¹⁵ = 170393 is a prime.

It is a Duffinian number.

203161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (203141) 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, 14505 + ... + 14518.

It is an arithmetic number, because the mean of its divisors is an integer number (58048).

2²⁰³¹⁶¹ is an apocalyptic number.

It is an amenable number.

203161 is a deficient number, since it is larger than the sum of its proper divisors (29031).

203161 is an equidigital number, since it uses as much as digits as its factorization.

203161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29030.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 203161 is about 450.7338460777. The cubic root of 203161 is about 58.7868397283.

Adding to 203161 its reverse (161302), we get a palindrome (364463).

The spelling of 203161 in words is "two hundred three thousand, one hundred sixty-one".