Base | Representation |
---|---|
bin | 1110011100111… |
… | …11100010000111 |
3 | 22110010121120210 |
4 | 13032133202013 |
5 | 222014132222 |
6 | 20010330503 |
7 | 3001343322 |
oct | 716374207 |
9 | 273117523 |
10 | 121239687 |
11 | 62489198 |
12 | 34729a33 |
13 | 1c16c27a |
14 | 1215d7b9 |
15 | a99cd0c |
hex | 739f887 |
121239687 has 4 divisors (see below), whose sum is σ = 161652920. Its totient is φ = 80826456.
The previous prime is 121239683. The next prime is 121239689. The reversal of 121239687 is 786932121.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 121239687 - 22 = 121239683 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (121239683) 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, 20206612 + ... + 20206617.
It is an arithmetic number, because the mean of its divisors is an integer number (40413230).
Almost surely, 2121239687 is an apocalyptic number.
121239687 is a deficient number, since it is larger than the sum of its proper divisors (40413233).
121239687 is an equidigital number, since it uses as much as digits as its factorization.
121239687 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 40413232.
The product of its digits is 36288, while the sum is 39.
The square root of 121239687 is about 11010.8894736075. The cubic root of 121239687 is about 494.9351164828.
The spelling of 121239687 in words is "one hundred twenty-one million, two hundred thirty-nine thousand, six hundred eighty-seven".
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