161203506 has 8 divisors (see below), whose sum is σ = 322407024. Its totient is φ = 53734500.

The previous prime is 161203501. The next prime is 161203519. The reversal of 161203506 is 605302161.

161203506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

161203506 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161203501) 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, 13433620 + ... + 13433631.

It is an arithmetic number, because the mean of its divisors is an integer number (40300878).

Almost surely, 2^161203506 is an apocalyptic number.

161203506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161203506 is a wasteful number, since it uses less digits than its factorization.

161203506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26867256.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 161203506 is about 12696.5942677554. The cubic root of 161203506 is about 544.2412987522.

Adding to 161203506 its reverse (605302161), we get a palindrome (766505667).

The spelling of 161203506 in words is "one hundred sixty-one million, two hundred three thousand, five hundred six".