161203 has 4 divisors (see below), whose sum is σ = 184240. Its totient is φ = 138168.

The previous prime is 161201. The next prime is 161221. The reversal of 161203 is 302161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 302161 = 43 ⋅7027.

It is a cyclic number.

It is not a de Polignac number, because 161203 - 2¹ = 161201 is a prime.

It is the 402-nd Hogben number.

161203 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (161201) by changing a digit.

It is a nontrivial repunit in base 401.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11508 + ... + 11521.

It is an arithmetic number, because the mean of its divisors is an integer number (46060).

2¹⁶¹²⁰³ is an apocalyptic number.

161203 is a deficient number, since it is larger than the sum of its proper divisors (23037).

161203 is an equidigital number, since it uses as much as digits as its factorization.

161203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23036.

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

The square root of 161203 is about 401.5009339964. The cubic root of 161203 is about 54.4240729314.

Adding to 161203 its reverse (302161), we get a palindrome (463364).

The spelling of 161203 in words is "one hundred sixty-one thousand, two hundred three".