| Base | Representation |
|---|---|
| bin | 10011010011000… |
| … | …01100110110100 |
| 3 | 102021121101022002 |
| 4 | 21221201212310 |
| 5 | 312420134000 |
| 6 | 24021354432 |
| 7 | 4003650545 |
| oct | 1151414664 |
| 9 | 367541262 |
| 10 | 161880500 |
| 11 | 83417241 |
| 12 | 46268a18 |
| 13 | 276cb6a2 |
| 14 | 176dc4cc |
| 15 | e3298d5 |
| hex | 9a619b4 |
161880500 has 36 divisors (see below), whose sum is σ = 354169452. Its totient is φ = 64638400.
The previous prime is 161880491. The next prime is 161880503. The reversal of 161880500 is 5088161.
It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.
161880500 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in 6 ways, for example, as 110586256 + 51294244 = 10516^2 + 7162^2 .
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (161880503) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 284216 + ... + 284784.
Almost surely, 2161880500 is an apocalyptic number.
161880500 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 161880500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177084726).
161880500 is an abundant number, since it is smaller than the sum of its proper divisors (192288952).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
161880500 is an frugal number, since it uses more digits than its factorization.
161880500 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1157 (or 576 counting only the distinct ones).
The product of its (nonzero) digits is 1920, while the sum is 29.
The square root of 161880500 is about 12723.2267919738. The cubic root of 161880500 is about 545.0021041919.
The spelling of 161880500 in words is "one hundred sixty-one million, eight hundred eighty thousand, five hundred".
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