| Base | Representation |
|---|---|
| bin | 10011010001100… |
| … | …00111010010000 |
| 3 | 102021020020200200 |
| 4 | 21220300322100 |
| 5 | 312342243130 |
| 6 | 24013215200 |
| 7 | 4002160203 |
| oct | 1150607220 |
| 9 | 367206620 |
| 10 | 161681040 |
| 11 | 832a03a4 |
| 12 | 46191500 |
| 13 | 2765b971 |
| 14 | 1768993a |
| 15 | e2da760 |
| hex | 9a30e90 |
161681040 has 120 divisors (see below), whose sum is σ = 556323768. Its totient is φ = 42055680.
The previous prime is 161680997. The next prime is 161681041. The reversal of 161681040 is 40186161.
161681040 is a `hidden beast` number, since 1 + 616 + 8 + 1 + 0 + 40 = 666.
It can be written as a sum of positive squares in 4 ways, for example, as 26749584 + 134931456 = 5172^2 + 11616^2 .
It is a tau number, because it is divible by the number of its divisors (120).
It is a super-2 number, since 2×1616810402 = 52281517390963200, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 161680995 and 161681013.
It is not an unprimeable number, because it can be changed into a prime (161681041) 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 23 ways as a sum of consecutive naturals, for example, 26782 + ... + 32258.
Almost surely, 2161681040 is an apocalyptic number.
161681040 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 161681040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278161884).
161681040 is an abundant number, since it is smaller than the sum of its proper divisors (394642728).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
161681040 is a wasteful number, since it uses less digits than its factorization.
161681040 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5537 (or 5528 counting only the distinct ones).
The product of its (nonzero) digits is 1152, while the sum is 27.
The square root of 161681040 is about 12715.3859556051. The cubic root of 161681040 is about 544.7781719343.
The spelling of 161681040 in words is "one hundred sixty-one million, six hundred eighty-one thousand, forty".
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