Base | Representation |
---|---|
bin | 10001010100000… |
… | …01110001001101 |
3 | 101010021200222212 |
4 | 20222001301031 |
5 | 244140010041 |
6 | 22224520205 |
7 | 3412322501 |
oct | 1052016115 |
9 | 333250885 |
10 | 145235021 |
11 | 74a88248 |
12 | 40780065 |
13 | 241210a9 |
14 | 15408301 |
15 | cb3c8eb |
hex | 8a81c4d |
145235021 has 2 divisors, whose sum is σ = 145235022. Its totient is φ = 145235020.
The previous prime is 145235003. The next prime is 145235023. The reversal of 145235021 is 120532541.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 138909796 + 6325225 = 11786^2 + 2515^2 .
It is an emirp because it is prime and its reverse (120532541) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 145235021 - 210 = 145233997 is a prime.
It is a super-2 number, since 2×1452350212 = 42186422649740882, which contains 22 as substring.
Together with 145235023, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (145235023) 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 as a sum of consecutive naturals, namely, 72617510 + 72617511.
It is an arithmetic number, because the mean of its divisors is an integer number (72617511).
Almost surely, 2145235021 is an apocalyptic number.
It is an amenable number.
145235021 is a deficient number, since it is larger than the sum of its proper divisors (1).
145235021 is an equidigital number, since it uses as much as digits as its factorization.
145235021 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 1200, while the sum is 23.
The square root of 145235021 is about 12051.3493435383. The cubic root of 145235021 is about 525.6424739141.
Adding to 145235021 its reverse (120532541), we get a palindrome (265767562).
The spelling of 145235021 in words is "one hundred forty-five million, two hundred thirty-five thousand, twenty-one".
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