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31220112 = 2437118447
BaseRepresentation
bin111011100011…
…0000110010000
32011202010221110
41313012012100
530443020422
63033053320
7526236510
oct167060620
964663843
1031220112
1116694150
12a557240
136611451
144209840
152b1a60c
hex1dc6190

31220112 has 80 divisors (see below), whose sum is σ = 100564992. Its totient is φ = 8108160.

The previous prime is 31220093. The next prime is 31220159. The reversal of 31220112 is 21102213.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528 + ... + 7919.

Almost surely, 231220112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31220112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50282496).

31220112 is an abundant number, since it is smaller than the sum of its proper divisors (69344880).

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

31220112 is a wasteful number, since it uses less digits than its factorization.

31220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8476 (or 8470 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 31220112 is about 5587.4960402671. The cubic root of 31220112 is about 314.8798130555.

Adding to 31220112 its reverse (21102213), we get a palindrome (52322325).

It can be divided in two parts, 312201 and 12, that added together give a palindrome (312213).

The spelling of 31220112 in words is "thirty-one million, two hundred twenty thousand, one hundred twelve".

Divisors: 1 2 3 4 6 7 8 11 12 14 16 21 22 24 28 33 42 44 48 56 66 77 84 88 112 132 154 168 176 231 264 308 336 462 528 616 924 1232 1848 3696 8447 16894 25341 33788 50682 59129 67576 92917 101364 118258 135152 177387 185834 202728 236516 278751 354774 371668 405456 473032 557502 650419 709548 743336 946064 1115004 1300838 1419096 1486672 1951257 2230008 2601676 2838192 3902514 4460016 5203352 7805028 10406704 15610056 31220112