161003 has 4 divisors (see below), whose sum is σ = 161928. Its totient is φ = 160080.

The previous prime is 160997. The next prime is 161009. The reversal of 161003 is 300161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 300161 = 41 ⋅7321.

It is an interprime number because it is at equal distance from previous prime (160997) and next prime (161009).

It is a cyclic number.

It is not a de Polignac number, because 161003 - 2¹⁰ = 159979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161009) by changing a digit.

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, 113 + ... + 578.

It is an arithmetic number, because the mean of its divisors is an integer number (40482).

2¹⁶¹⁰⁰³ is an apocalyptic number.

161003 is a deficient number, since it is larger than the sum of its proper divisors (925).

161003 is an equidigital number, since it uses as much as digits as its factorization.

161003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 161003 is about 401.2517912733. The cubic root of 161003 is about 54.4015561478.

Adding to 161003 its reverse (300161), we get a palindrome (461164).

The spelling of 161003 in words is "one hundred sixty-one thousand, three".