161011200 has 240 divisors, whose sum is σ = 608889600. Its totient is φ = 36741120.

The previous prime is 161011189. The next prime is 161011211. The reversal of 161011200 is 2110161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161011189) and next prime (161011211).

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 268501 + ... + 269099.

It is an arithmetic number, because the mean of its divisors is an integer number (2537040).

Almost surely, 2^161011200 is an apocalyptic number.

161011200 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 161011200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304444800).

161011200 is an abundant number, since it is smaller than the sum of its proper divisors (447878400).

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

161011200 is an equidigital number, since it uses as much as digits as its factorization.

161011200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 161011200 is about 12689.0188746018. The cubic root of 161011200 is about 544.0247970242.

Adding to 161011200 its reverse (2110161), we get a palindrome (163121361).

The spelling of 161011200 in words is "one hundred sixty-one million, eleven thousand, two hundred".