Base | Representation |
---|---|
bin | 11101000100010101… |
… | …010101000110010001 |
3 | 2222120011101220112022 |
4 | 131010111111012101 |
5 | 1002410032310301 |
6 | 22201020341225 |
7 | 2153304635450 |
oct | 350425250621 |
9 | 88504356468 |
10 | 31211213201 |
11 | 12266a09483 |
12 | 60706a4815 |
13 | 2c352b43bc |
14 | 1721256b97 |
15 | c2a12bd1b |
hex | 744555191 |
31211213201 has 16 divisors (see below), whose sum is σ = 36411702144. Its totient is φ = 26200779264.
The previous prime is 31211213197. The next prime is 31211213203. The reversal of 31211213201 is 10231211213.
It is a cyclic number.
It is not a de Polignac number, because 31211213201 - 22 = 31211213197 is a prime.
It is a Duffinian number.
It is a Curzon number.
It is a self number, because there is not a number n which added to its sum of digits gives 31211213201.
It is not an unprimeable number, because it can be changed into a prime (31211213203) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111200 + ... + 273473.
It is an arithmetic number, because the mean of its divisors is an integer number (2275731384).
Almost surely, 231211213201 is an apocalyptic number.
It is an amenable number.
31211213201 is a deficient number, since it is larger than the sum of its proper divisors (5200488943).
31211213201 is a wasteful number, since it uses less digits than its factorization.
31211213201 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 384920.
The product of its (nonzero) digits is 72, while the sum is 17.
Adding to 31211213201 its reverse (10231211213), we get a palindrome (41442424414).
The spelling of 31211213201 in words is "thirty-one billion, two hundred eleven million, two hundred thirteen thousand, two hundred one".
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