Base | Representation |
---|---|
bin | 10001010110100… |
… | …10100000011001 |
3 | 101010220111122000 |
4 | 20223102200121 |
5 | 244231100341 |
6 | 22235551213 |
7 | 3415200600 |
oct | 1053224031 |
9 | 333814560 |
10 | 145565721 |
11 | 75193754 |
12 | 408bb509 |
13 | 24208782 |
14 | 15492a37 |
15 | cba58b6 |
hex | 8ad2819 |
145565721 has 48 divisors (see below), whose sum is σ = 256308480. Its totient is φ = 81375840.
The previous prime is 145565711. The next prime is 145565729. The reversal of 145565721 is 127565541.
It is not a de Polignac number, because 145565721 - 26 = 145565657 is a prime.
It is not an unprimeable number, because it can be changed into a prime (145565729) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61011 + ... + 63351.
It is an arithmetic number, because the mean of its divisors is an integer number (5339760).
Almost surely, 2145565721 is an apocalyptic number.
It is an amenable number.
145565721 is a deficient number, since it is larger than the sum of its proper divisors (110742759).
145565721 is a wasteful number, since it uses less digits than its factorization.
145565721 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2411 (or 2398 counting only the distinct ones).
The product of its digits is 42000, while the sum is 36.
The square root of 145565721 is about 12065.0619973542. The cubic root of 145565721 is about 526.0411339496.
It can be divided in two parts, 1455 and 65721, that added together give a palindrome (67176).
The spelling of 145565721 in words is "one hundred forty-five million, five hundred sixty-five thousand, seven hundred twenty-one".
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