161543200 has 216 divisors, whose sum is σ = 495601092. Its totient is φ = 50964480.

The previous prime is 161543171. The next prime is 161543209. The reversal of 161543200 is 2345161.

It can be written as a sum of positive squares in 6 ways, for example, as 4892944 + 156650256 = 2212^2 + 12516^2 .

It is not an unprimeable number, because it can be changed into a prime (161543209) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 509442 + ... + 509758.

Almost surely, 2^161543200 is an apocalyptic number.

161543200 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 161543200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247800546).

161543200 is an abundant number, since it is smaller than the sum of its proper divisors (334057892).

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

161543200 is a wasteful number, since it uses less digits than its factorization.

161543200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 161543200 is about 12709.9645947579. The cubic root of 161543200 is about 544.6233123558.

Adding to 161543200 its reverse (2345161), we get a palindrome (163888361).

The spelling of 161543200 in words is "one hundred sixty-one million, five hundred forty-three thousand, two hundred".