145509593 has 4 divisors (see below), whose sum is σ = 145535460. Its totient is φ = 145483728.

The previous prime is 145509527. The next prime is 145509607. The reversal of 145509593 is 395905541.

It is a happy number.

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 63552784 + 81956809 = 7972^2 + 9053^2 .

It is a cyclic number.

It is not a de Polignac number, because 145509593 - 2⁸ = 145509337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145509593.

It is not an unprimeable number, because it can be changed into a prime (145509503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530 + ... + 17067.

It is an arithmetic number, because the mean of its divisors is an integer number (36383865).

Almost surely, 2^145509593 is an apocalyptic number.

It is an amenable number.

145509593 is a deficient number, since it is larger than the sum of its proper divisors (25867).

145509593 is an equidigital number, since it uses as much as digits as its factorization.

145509593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25866.

The product of its (nonzero) digits is 121500, while the sum is 41.

The square root of 145509593 is about 12062.7357179041. The cubic root of 145509593 is about 525.9735140176.

The spelling of 145509593 in words is "one hundred forty-five million, five hundred nine thousand, five hundred ninety-three".