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231012 = 22342331
BaseRepresentation
bin111000011001100100
3102201220000
4320121210
524343022
64541300
71651335
oct703144
9381800
10231012
11148621
12b1830
13811c2
146028c
15486ac
hex38664

231012 has 60 divisors (see below), whose sum is σ = 650496. Its totient is φ = 71280.

The previous prime is 231001. The next prime is 231017. The reversal of 231012 is 210132.

Adding to 231012 its reverse (210132), we get a palindrome (441144).

It can be divided in two parts, 23 and 1012, that added together give a triangular number (1035 = T45).

231012 = 892 + 902 + ... + 1112.

It is a happy number.

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 = 230985 and 231003.

It is not an unprimeable number, because it can be changed into a prime (231017) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7437 + ... + 7467.

2231012 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 231012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325248).

231012 is an abundant number, since it is smaller than the sum of its proper divisors (419484).

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

231012 is a wasteful number, since it uses less digits than its factorization.

231012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 231012 is about 480.6370772215. The cubic root of 231012 is about 61.3589868531.

The spelling of 231012 in words is "two hundred thirty-one thousand, twelve".

Divisors: 1 2 3 4 6 9 12 18 23 27 31 36 46 54 62 69 81 92 93 108 124 138 162 186 207 276 279 324 372 414 558 621 713 828 837 1116 1242 1426 1674 1863 2139 2484 2511 2852 3348 3726 4278 5022 6417 7452 8556 10044 12834 19251 25668 38502 57753 77004 115506 231012