Base | Representation |
---|---|
bin | 10011110010011… |
… | …11100101011111 |
3 | 102120100201112212 |
4 | 21321033211133 |
5 | 314444012431 |
6 | 24245551035 |
7 | 4053661622 |
oct | 1171174537 |
9 | 376321485 |
10 | 166000991 |
11 | 85781002 |
12 | 4771547b |
13 | 28512050 |
14 | 18091db9 |
15 | e89072b |
hex | 9e4f95f |
166000991 has 4 divisors (see below), whose sum is σ = 178770312. Its totient is φ = 153231672.
The previous prime is 166000987. The next prime is 166001021. The reversal of 166000991 is 199000661.
It is a happy number.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 166000991 - 22 = 166000987 is a prime.
166000991 is a strobogrammatic number because it is the same when read upside-down.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (166000921) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6384641 + ... + 6384666.
It is an arithmetic number, because the mean of its divisors is an integer number (44692578).
Almost surely, 2166000991 is an apocalyptic number.
166000991 is a deficient number, since it is larger than the sum of its proper divisors (12769321).
166000991 is a wasteful number, since it uses less digits than its factorization.
166000991 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 12769320.
The product of its (nonzero) digits is 2916, while the sum is 32.
The square root of 166000991 is about 12884.1371849263. The cubic root of 166000991 is about 549.5875596623.
The spelling of 166000991 in words is "one hundred sixty-six million, nine hundred ninety-one", and thus it is an aban number.
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