| Base | Representation |
|---|---|
| bin | 100111000100111… |
| … | …1111101111001010 |
| 3 | 10101101100001112100 |
| 4 | 1032021333233022 |
| 5 | 10141134240320 |
| 6 | 334040254230 |
| 7 | 44331245334 |
| oct | 11611775712 |
| 9 | 3341301470 |
| 10 | 1311243210 |
| 11 | 613187482 |
| 12 | 307171376 |
| 13 | 17b873674 |
| 14 | c620a454 |
| 15 | 7a1b1790 |
| hex | 4e27fbca |
1311243210 has 96 divisors (see below), whose sum is σ = 3454261200. Its totient is φ = 345083904.
The previous prime is 1311243173. The next prime is 1311243211. The reversal of 1311243210 is 123421131.
It can be written as a sum of positive squares in 8 ways, for example, as 93721761 + 1217521449 = 9681^2 + 34893^2 .
It is a super-2 number, since 2×13112432102 = 3438717511542208200, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (1311243211) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3714394 + ... + 3714746.
Almost surely, 21311243210 is an apocalyptic number.
1311243210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 1311243210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1727130600).
1311243210 is an abundant number, since it is smaller than the sum of its proper divisors (2143017990).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1311243210 is a wasteful number, since it uses less digits than its factorization.
1311243210 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 792 (or 789 counting only the distinct ones).
The product of its (nonzero) digits is 144, while the sum is 18.
The square root of 1311243210 is about 36211.0923613193. The cubic root of 1311243210 is about 1094.5302044240.
Adding to 1311243210 its reverse (123421131), we get a palindrome (1434664341).
The spelling of 1311243210 in words is "one billion, three hundred eleven million, two hundred forty-three thousand, two hundred ten".
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