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12531222 = 23211193331
BaseRepresentation
bin101111110011…
…011000010110
3212120122121100
4233303120112
511201444342
61124330530
7211341114
oct57633026
925518540
1012531222
117089990
124243a46
132799a32
141942ab4
151177e4c
hexbf3616

12531222 has 48 divisors (see below), whose sum is σ = 31187520. Its totient is φ = 3596400.

The previous prime is 12531221. The next prime is 12531247. The reversal of 12531222 is 22213521.

Adding to 12531222 its reverse (22213521), we get a palindrome (34744743).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12531195 and 12531204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2097 + ... + 5427.

It is an arithmetic number, because the mean of its divisors is an integer number (649740).

Almost surely, 212531222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12531222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15593760).

12531222 is an abundant number, since it is smaller than the sum of its proper divisors (18656298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12531222 is a wasteful number, since it uses less digits than its factorization.

12531222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3369 (or 3366 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 12531222 is about 3539.9466097669. The cubic root of 12531222 is about 232.2725072747.

The spelling of 12531222 in words is "twelve million, five hundred thirty-one thousand, two hundred twenty-two".

Divisors: 1 2 3 6 9 11 18 19 22 33 38 57 66 99 114 171 198 209 342 418 627 1254 1881 3331 3762 6662 9993 19986 29979 36641 59958 63289 73282 109923 126578 189867 219846 329769 379734 569601 659538 696179 1139202 1392358 2088537 4177074 6265611 12531222