| Base | Representation |
|---|---|
| bin | 11100110111110011… |
| … | …011100010011010100 |
| 3 | 2222000111212010122110 |
| 4 | 130313303130103110 |
| 5 | 1001442224100340 |
| 6 | 22124111031020 |
| 7 | 2145143115405 |
| oct | 346763342324 |
| 9 | 88014763573 |
| 10 | 31001003220 |
| 11 | 12169292620 |
| 12 | 601220b470 |
| 13 | 2c00893ab5 |
| 14 | 17013779ac |
| 15 | c16957680 |
| hex | 737cdc4d4 |
31001003220 has 96 divisors (see below), whose sum is σ = 94980727296. Its totient is φ = 7492636800.
The previous prime is 31001003213. The next prime is 31001003227. The reversal of 31001003220 is 2230010013.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (31001003213) and next prime (31001003227).
It is a super-2 number, since 2×310010032202 (a number of 22 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (12).
It is a junction number, because it is equal to n+sod(n) for n = 31001003196 and 31001003205.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (31001003227) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147507 + ... + 289413.
It is an arithmetic number, because the mean of its divisors is an integer number (989382576).
Almost surely, 231001003220 is an apocalyptic number.
31001003220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 31001003220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47490363648).
31001003220 is an abundant number, since it is smaller than the sum of its proper divisors (63979724076).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31001003220 is a wasteful number, since it uses less digits than its factorization.
31001003220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 142261 (or 142259 counting only the distinct ones).
The product of its (nonzero) digits is 36, while the sum is 12.
Adding to 31001003220 its reverse (2230010013), we get a palindrome (33231013233).
The spelling of 31001003220 in words is "thirty-one billion, one million, three thousand, two hundred twenty".
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