161320203 has 48 divisors (see below), whose sum is σ = 269942400. Its totient is φ = 91808640.

The previous prime is 161320193. The next prime is 161320217. The reversal of 161320203 is 302023161.

161320203 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161320203 - 2¹² = 161316107 is a prime.

It is a super-2 number, since 2×161320203² = 52048415791922418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161320223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 261151 + ... + 261767.

It is an arithmetic number, because the mean of its divisors is an integer number (5623800).

Almost surely, 2^161320203 is an apocalyptic number.

161320203 is a deficient number, since it is larger than the sum of its proper divisors (108622197).

161320203 is a wasteful number, since it uses less digits than its factorization.

161320203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 161320203 is about 12701.1890388262. The cubic root of 161320203 is about 544.3725945060.

Adding to 161320203 its reverse (302023161), we get a palindrome (463343364).

The spelling of 161320203 in words is "one hundred sixty-one million, three hundred twenty thousand, two hundred three".