161900200 has 96 divisors (see below), whose sum is σ = 469344960. Its totient is φ = 50457600.

The previous prime is 161900191. The next prime is 161900209. The reversal of 161900200 is 2009161.

It is an interprime number because it is at equal distance from previous prime (161900191) and next prime (161900209).

It is not an unprimeable number, because it can be changed into a prime (161900209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10144 + ... + 20656.

It is an arithmetic number, because the mean of its divisors is an integer number (4889010).

Almost surely, 2^161900200 is an apocalyptic number.

161900200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161900200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234672480).

161900200 is an abundant number, since it is smaller than the sum of its proper divisors (307444760).

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

161900200 is a wasteful number, since it uses less digits than its factorization.

161900200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10547 (or 10538 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 161900200 is about 12724.0009430996. Note that the first 3 decimals coincide. The cubic root of 161900200 is about 545.0242112522.

Adding to 161900200 its reverse (2009161), we get a palindrome (163909361).

The spelling of 161900200 in words is "one hundred sixty-one million, nine hundred thousand, two hundred".