161197800 has 96 divisors (see below), whose sum is σ = 521484480. Its totient is φ = 41113600.

The previous prime is 161197783. The next prime is 161197837. The reversal of 161197800 is 8791161.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7960 + ... + 19640.

It is an arithmetic number, because the mean of its divisors is an integer number (5432130).

Almost surely, 2^161197800 is an apocalyptic number.

161197800 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 161197800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260742240).

161197800 is an abundant number, since it is smaller than the sum of its proper divisors (360286680).

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

161197800 is a wasteful number, since it uses less digits than its factorization.

161197800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11723 (or 11714 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 33.

The square root of 161197800 is about 12696.3695598387. The cubic root of 161197800 is about 544.2348773090.

The spelling of 161197800 in words is "one hundred sixty-one million, one hundred ninety-seven thousand, eight hundred".