Base | Representation |
---|---|
bin | 11101001000111001101… |
… | …01101101001111111011 |
3 | 10112201022010112211022121 |
4 | 32210130311231033323 |
5 | 112400440033032422 |
6 | 2043541115102111 |
7 | 132222642650365 |
oct | 16443465551773 |
9 | 3481263484277 |
10 | 1001211220987 |
11 | 35667a6a617a |
12 | 14205b741937 |
13 | 7354c1bb553 |
14 | 3665d257d35 |
15 | 1b09cc6b8c7 |
hex | e91cd6d3fb |
1001211220987 has 2 divisors, whose sum is σ = 1001211220988. Its totient is φ = 1001211220986.
The previous prime is 1001211220943. The next prime is 1001211221033. The reversal of 1001211220987 is 7890221121001.
It is a weak prime.
It is an emirp because it is prime and its reverse (7890221121001) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 1001211220987 - 223 = 1001202832379 is a prime.
It is not a weakly prime, because it can be changed into another prime (1001211220907) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500605610493 + 500605610494.
It is an arithmetic number, because the mean of its divisors is an integer number (500605610494).
Almost surely, 21001211220987 is an apocalyptic number.
1001211220987 is a deficient number, since it is larger than the sum of its proper divisors (1).
1001211220987 is an equidigital number, since it uses as much as digits as its factorization.
1001211220987 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 4032, while the sum is 34.
Adding to 1001211220987 its reverse (7890221121001), we get a palindrome (8891432341988).
The spelling of 1001211220987 in words is "one trillion, one billion, two hundred eleven million, two hundred twenty thousand, nine hundred eighty-seven".
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