145609 has 4 divisors (see below), whose sum is σ = 150660. Its totient is φ = 140560.

The previous prime is 145603. The next prime is 145633. The reversal of 145609 is 906541.

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 107584 + 38025 = 328^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 145609 - 2³ = 145601 is a prime.

It is a Duffinian number.

145609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (145601) 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, 2482 + ... + 2539.

It is an arithmetic number, because the mean of its divisors is an integer number (37665).

2¹⁴⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

145609 is a deficient number, since it is larger than the sum of its proper divisors (5051).

145609 is an equidigital number, since it uses as much as digits as its factorization.

145609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 145609 is about 381.5874735890. The cubic root of 145609 is about 52.6093262244.

Adding to 145609 its product of nonzero digits (1080), we get a square (146689 = 383²).

The spelling of 145609 in words is "one hundred forty-five thousand, six hundred nine".