Base | Representation |
---|---|
bin | 111100101111… |
… | …0110000101101 |
3 | 2012220220201001 |
4 | 1321132300231 |
5 | 31123023141 |
6 | 3054320301 |
7 | 534452536 |
oct | 171366055 |
9 | 65826631 |
10 | 31845421 |
11 | 16a80a33 |
12 | a7b9091 |
13 | 679cc5a |
14 | 432d68d |
15 | 2be0a31 |
hex | 1e5ec2d |
31845421 has 4 divisors (see below), whose sum is σ = 32446332. Its totient is φ = 31244512.
The previous prime is 31845389. The next prime is 31845431. The reversal of 31845421 is 12454813.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 25867396 + 5978025 = 5086^2 + 2445^2 .
It is a cyclic number.
It is not a de Polignac number, because 31845421 - 25 = 31845389 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 31845421.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (31845431) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300376 + ... + 300481.
It is an arithmetic number, because the mean of its divisors is an integer number (8111583).
Almost surely, 231845421 is an apocalyptic number.
It is an amenable number.
31845421 is a deficient number, since it is larger than the sum of its proper divisors (600911).
31845421 is an equidigital number, since it uses as much as digits as its factorization.
31845421 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 600910.
The product of its digits is 3840, while the sum is 28.
The square root of 31845421 is about 5643.1747270486. The cubic root of 31845421 is about 316.9681790613.
The spelling of 31845421 in words is "thirty-one million, eight hundred forty-five thousand, four hundred twenty-one".
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