| Base | Representation |
|---|---|
| bin | 11101001111101001… |
| … | …110100010110000000 |
| 3 | 10000001101202212010020 |
| 4 | 131033221310112000 |
| 5 | 1003302142232230 |
| 6 | 22231523133440 |
| 7 | 2161102141665 |
| oct | 351751642600 |
| 9 | 100041685106 |
| 10 | 31401133440 |
| 11 | 12354137356 |
| 12 | 6104214280 |
| 13 | 2c6574c741 |
| 14 | 173c573a6c |
| 15 | c3bb44810 |
| hex | 74fa74580 |
31401133440 has 128 divisors (see below), whose sum is σ = 100616325120. Its totient is φ = 8329697280.
The previous prime is 31401133417. The next prime is 31401133441. The reversal of 31401133440 is 4433110413.
It is a tau number, because it is divible by the number of its divisors (128).
It is a Harshad number since it is a multiple of its sum of digits (24).
It is a self number, because there is not a number n which added to its sum of digits gives 31401133440.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (31401133441) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323907 + ... + 409533.
It is an arithmetic number, because the mean of its divisors is an integer number (786065040).
Almost surely, 231401133440 is an apocalyptic number.
31401133440 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 31401133440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50308162560).
31401133440 is an abundant number, since it is smaller than the sum of its proper divisors (69215191680).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31401133440 is a wasteful number, since it uses less digits than its factorization.
31401133440 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 85840 (or 85828 counting only the distinct ones).
The product of its (nonzero) digits is 1728, while the sum is 24.
Adding to 31401133440 its reverse (4433110413), we get a palindrome (35834243853).
The spelling of 31401133440 in words is "thirty-one billion, four hundred one million, one hundred thirty-three thousand, four hundred forty".
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