The number 145
Numeral systems
Binary: 10010001
Septimal (base 7): 265
Octal: 221
Hexadecimal: 91
Base 24: 61
Factorization
145 = 5 × 29
145 has 4 divisors: 1, 5, 29, 145
Sum of all divisors other than 145:
35
Sums & differences
Sum of 2 squares: 145 = 92 + 82
Difference of 2 squares: 145 = 172 - 122 = 732 - 722
Characteristics
145 is a pentagonal number
145 is a Layland number, 145 = 43 + 34
Related primes
The 145th prime number is:
829Previous prime number:
139 — Next prime number:
149