145609549 has 4 divisors (see below), whose sum is σ = 146213980. Its totient is φ = 145005120.

The previous prime is 145609547. The next prime is 145609553. The reversal of 145609549 is 945906541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 945906541 = 127 ⋅7448083.

It can be written as a sum of positive squares in 2 ways, for example, as 97653924 + 47955625 = 9882^2 + 6925^2 .

It is a cyclic number.

It is not a de Polignac number, because 145609549 - 2¹ = 145609547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145609547) 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, 301854 + ... + 302335.

It is an arithmetic number, because the mean of its divisors is an integer number (36553495).

Almost surely, 2^145609549 is an apocalyptic number.

It is an amenable number.

145609549 is a deficient number, since it is larger than the sum of its proper divisors (604431).

145609549 is an equidigital number, since it uses as much as digits as its factorization.

145609549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604430.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 145609549 is about 12066.8781795459. The cubic root of 145609549 is about 526.0939234323.

The spelling of 145609549 in words is "one hundred forty-five million, six hundred nine thousand, five hundred forty-nine".