145683809 has 4 divisors (see below), whose sum is σ = 145711620. Its totient is φ = 145656000.

The previous prime is 145683757. The next prime is 145683827. The reversal of 145683809 is 908386541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908386541 = 23 ⋅39495067.

It can be written as a sum of positive squares in 2 ways, for example, as 48720400 + 96963409 = 6980^2 + 9847^2 .

It is a cyclic number.

It is not a de Polignac number, because 145683809 - 2⁸ = 145683553 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 145683809.

It is not an unprimeable number, because it can be changed into a prime (145683869) 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, 3404 + ... + 17405.

It is an arithmetic number, because the mean of its divisors is an integer number (36427905).

Almost surely, 2^145683809 is an apocalyptic number.

It is an amenable number.

145683809 is a deficient number, since it is larger than the sum of its proper divisors (27811).

145683809 is an equidigital number, since it uses as much as digits as its factorization.

145683809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27810.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 145683809 is about 12069.9548052178. The cubic root of 145683809 is about 526.1833431521.

The spelling of 145683809 in words is "one hundred forty-five million, six hundred eighty-three thousand, eight hundred nine".