161109936 has 120 divisors (see below), whose sum is σ = 491531040. Its totient is φ = 48964608.

The previous prime is 161109931. The next prime is 161109953. The reversal of 161109936 is 639901161.

161109936 is a `hidden beast` number, since 1 + 611 + 0 + 9 + 9 + 36 = 666.

161109936 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161109936² = 51912822955848192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161109936.

It is not an unprimeable number, because it can be changed into a prime (161109931) 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, 166125 + ... + 167091.

It is an arithmetic number, because the mean of its divisors is an integer number (4096092).

Almost surely, 2^161109936 is an apocalyptic number.

161109936 is a gapful number since it is divisible by the number (16) 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 161109936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245765520).

161109936 is an abundant number, since it is smaller than the sum of its proper divisors (330421104).

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

161109936 is a wasteful number, since it uses less digits than its factorization.

161109936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1074 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 161109936 is about 12692.9088864610. The cubic root of 161109936 is about 544.1359773983.

The spelling of 161109936 in words is "one hundred sixty-one million, one hundred nine thousand, nine hundred thirty-six".