| Base | Representation |
|---|---|
| bin | 10011001101010… |
| … | …00001101100000 |
| 3 | 102020011210121220 |
| 4 | 21212220031200 |
| 5 | 312221333440 |
| 6 | 23553215040 |
| 7 | 3664335606 |
| oct | 1146501540 |
| 9 | 366153556 |
| 10 | 161121120 |
| 11 | 82a48756 |
| 12 | 45b61480 |
| 13 | 274c3b54 |
| 14 | 17581876 |
| 15 | e2298d0 |
| hex | 99a8360 |
161121120 has 48 divisors (see below), whose sum is σ = 507533040. Its totient is φ = 42965504.
The previous prime is 161121109. The next prime is 161121127. The reversal of 161121120 is 21121161.
It is a happy number.
161121120 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a tau number, because it is divible by the number of its divisors (48).
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a self number, because there is not a number n which added to its sum of digits gives 161121120.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (161121127) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167355 + ... + 168314.
It is an arithmetic number, because the mean of its divisors is an integer number (10573605).
Almost surely, 2161121120 is an apocalyptic number.
161121120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
161121120 is an abundant number, since it is smaller than the sum of its proper divisors (346411920).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
161121120 is a wasteful number, since it uses less digits than its factorization.
161121120 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 335687 (or 335679 counting only the distinct ones).
The product of its (nonzero) digits is 24, while the sum is 15.
The square root of 161121120 is about 12693.3494397657. The cubic root of 161121120 is about 544.1485681301.
Adding to 161121120 its reverse (21121161), we get a palindrome (182242281).
The spelling of 161121120 in words is "one hundred sixty-one million, one hundred twenty-one thousand, one hundred twenty".
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