13145309 has 4 divisors (see below), whose sum is σ = 13165404. Its totient is φ = 13125216.

The previous prime is 13145299. The next prime is 13145311. The reversal of 13145309 is 90354131.

13145309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90354131 = 7 ⋅12907733.

It can be written as a sum of positive squares in 2 ways, for example, as 6400900 + 6744409 = 2530^2 + 2597^2 .

It is a cyclic number.

It is not a de Polignac number, because 13145309 - 2⁸ = 13145053 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 (13145339) 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, 9032 + ... + 10385.

It is an arithmetic number, because the mean of its divisors is an integer number (3291351).

Almost surely, 2^13145309 is an apocalyptic number.

It is an amenable number.

13145309 is a deficient number, since it is larger than the sum of its proper divisors (20095).

13145309 is an equidigital number, since it uses as much as digits as its factorization.

13145309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20094.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 13145309 is about 3625.6460114027. The cubic root of 13145309 is about 236.0063019001.

The spelling of 13145309 in words is "thirteen million, one hundred forty-five thousand, three hundred nine".