Base | Representation |
---|---|
bin | 1010110111010… |
… | …10101000110001 |
3 | 20100111022200001 |
4 | 11123222220301 |
5 | 141312413414 |
6 | 13013230001 |
7 | 2154444142 |
oct | 533525061 |
9 | 210438601 |
10 | 91138609 |
11 | 47499871 |
12 | 26632301 |
13 | 15b60293 |
14 | c165ac9 |
15 | 8004074 |
hex | 56eaa31 |
91138609 has 4 divisors (see below), whose sum is σ = 91262016. Its totient is φ = 91015204.
The previous prime is 91138603. The next prime is 91138631. The reversal of 91138609 is 90683119.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 91138609 - 23 = 91138601 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (91138601) 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, 60589 + ... + 62074.
It is an arithmetic number, because the mean of its divisors is an integer number (22815504).
Almost surely, 291138609 is an apocalyptic number.
It is an amenable number.
91138609 is a deficient number, since it is larger than the sum of its proper divisors (123407).
91138609 is a wasteful number, since it uses less digits than its factorization.
91138609 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 123406.
The product of its (nonzero) digits is 11664, while the sum is 37.
The square root of 91138609 is about 9546.6543354203. The cubic root of 91138609 is about 450.0224005310.
The spelling of 91138609 in words is "ninety-one million, one hundred thirty-eight thousand, six hundred nine".
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