161317800 has 432 divisors, whose sum is σ = 661564800. Its totient is φ = 35078400.

The previous prime is 161317789. The next prime is 161317853. The reversal of 161317800 is 8713161.

It is an unprimeable number.

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 107 ways as a sum of consecutive naturals, for example, 2734171 + ... + 2734229.

It is an arithmetic number, because the mean of its divisors is an integer number (1531400).

Almost surely, 2^161317800 is an apocalyptic number.

161317800 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 161317800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330782400).

161317800 is an abundant number, since it is smaller than the sum of its proper divisors (500247000).

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

161317800 is a wasteful number, since it uses less digits than its factorization.

161317800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 161317800 is about 12701.0944410314. The cubic root of 161317800 is about 544.3698915301.

The spelling of 161317800 in words is "one hundred sixty-one million, three hundred seventeen thousand, eight hundred".