| Base | Representation |
|---|---|
| bin | 100100001010011… |
| … | …1010100001010011 |
| 3 | 10010120022020200011 |
| 4 | 1020110322201103 |
| 5 | 4441120122011 |
| 6 | 320224135351 |
| 7 | 42033042106 |
| oct | 11024724123 |
| 9 | 3116266604 |
| 10 | 1213442131 |
| 11 | 572a58040 |
| 12 | 29a467557 |
| 13 | 16451c9c5 |
| 14 | b722c73d |
| 15 | 717e3621 |
| hex | 4853a853 |
1213442131 has 4 divisors (see below), whose sum is σ = 1323755064. Its totient is φ = 1103129200.
The previous prime is 1213442129. The next prime is 1213442137. The reversal of 1213442131 is 1312443121.
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 1213442131 - 21 = 1213442129 is a prime.
It is a super-2 number, since 2×12134421312 = 2944883610571642322, which contains 22 as substring.
It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1213442137) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55156450 + ... + 55156471.
It is an arithmetic number, because the mean of its divisors is an integer number (330938766).
Almost surely, 21213442131 is an apocalyptic number.
1213442131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
1213442131 is a deficient number, since it is larger than the sum of its proper divisors (110312933).
1213442131 is a wasteful number, since it uses less digits than its factorization.
1213442131 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 110312932.
The product of its digits is 576, while the sum is 22.
The square root of 1213442131 is about 34834.4962788326. The cubic root of 1213442131 is about 1066.6117325984.
Adding to 1213442131 its reverse (1312443121), we get a palindrome (2525885252).
It can be divided in two parts, 1213 and 442131, that added together give a palindrome (443344).
The spelling of 1213442131 in words is "one billion, two hundred thirteen million, four hundred forty-two thousand, one hundred thirty-one".
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