161803 has 4 divisors (see below), whose sum is σ = 162720. Its totient is φ = 160888.

The previous prime is 161783. The next prime is 161807. The reversal of 161803 is 308161.

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.

It is a cyclic number.

It is not a de Polignac number, because 161803 - 2⁵ = 161771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161807) 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, 100 + ... + 577.

It is an arithmetic number, because the mean of its divisors is an integer number (40680).

2¹⁶¹⁸⁰³ is an apocalyptic number.

161803 is a deficient number, since it is larger than the sum of its proper divisors (917).

161803 is an equidigital number, since it uses as much as digits as its factorization.

161803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 161803 is about 402.2474362877. The cubic root of 161803 is about 54.4915117381.

Adding to 161803 its reverse (308161), we get a palindrome (469964).

The spelling of 161803 in words is "one hundred sixty-one thousand, eight hundred three".