161031200 has 144 divisors (see below), whose sum is σ = 444346560. Its totient is φ = 56448000.

The previous prime is 161031179. The next prime is 161031209. The reversal of 161031200 is 2130161.

It is not an unprimeable number, because it can be changed into a prime (161031209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254885 + ... + 255515.

It is an arithmetic number, because the mean of its divisors is an integer number (3085740).

Almost surely, 2^161031200 is an apocalyptic number.

161031200 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 161031200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222173280).

161031200 is an abundant number, since it is smaller than the sum of its proper divisors (283315360).

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

161031200 is a wasteful number, since it uses less digits than its factorization.

161031200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 161031200 is about 12689.8069331255. The cubic root of 161031200 is about 544.0473214314.

Adding to 161031200 its reverse (2130161), we get a palindrome (163161361).

The spelling of 161031200 in words is "one hundred sixty-one million, thirty-one thousand, two hundred".