145505 has 4 divisors (see below), whose sum is σ = 174612. Its totient is φ = 116400.

The previous prime is 145501. The next prime is 145511. The reversal of 145505 is 505541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505541 = 223 ⋅2267.

It can be written as a sum of positive squares in 2 ways, for example, as 18769 + 126736 = 137^2 + 356^2 .

It is not a de Polignac number, because 145505 - 2² = 145501 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 145505.

It is not an unprimeable number, because it can be changed into a prime (145501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14546 + ... + 14555.

It is an arithmetic number, because the mean of its divisors is an integer number (43653).

2¹⁴⁵⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

145505 is a deficient number, since it is larger than the sum of its proper divisors (29107).

145505 is an equidigital number, since it uses as much as digits as its factorization.

145505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29106.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 145505 is about 381.4511764302. The cubic root of 145505 is about 52.5967979854.

The spelling of 145505 in words is "one hundred forty-five thousand, five hundred five".