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31001112 = 2332430571
BaseRepresentation
bin111011001000…
…0101000011000
32011100000112100
41312100220120
530414013422
63024243400
7524335152
oct166205030
964300470
1031001112
111655465a
12a470560
13656586c
14418dad2
152ac57ac
hex1d90a18

31001112 has 24 divisors (see below), whose sum is σ = 83961540. Its totient is φ = 10333680.

The previous prime is 31001111. The next prime is 31001119. The reversal of 31001112 is 21110013.

Adding to 31001112 its reverse (21110013), we get a palindrome (52111125).

It can be divided in two parts, 31001 and 112, that added together give a palindrome (31113).

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×310011122 = 1922137890473088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 31001094 and 31001103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215214 + ... + 215357.

Almost surely, 231001112 is an apocalyptic number.

It is an amenable number.

31001112 is an abundant number, since it is smaller than the sum of its proper divisors (52960428).

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

31001112 is a wasteful number, since it uses less digits than its factorization.

31001112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430583 (or 430576 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 31001112 is about 5567.8642224824. The cubic root of 31001112 is about 314.1418213397.

The spelling of 31001112 in words is "thirty-one million, one thousand, one hundred twelve".

Divisors: 1 2 3 4 6 8 9 12 18 24 36 72 430571 861142 1291713 1722284 2583426 3444568 3875139 5166852 7750278 10333704 15500556 31001112