13205145 has 8 divisors (see below), whose sum is σ = 21128256. Its totient is φ = 7042736.

The previous prime is 13205131. The next prime is 13205147. The reversal of 13205145 is 54150231.

13205145 = 848² + 849² + ... + 865².

13205145 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13205145 - 2⁶ = 13205081 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13205147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440157 + ... + 440186.

It is an arithmetic number, because the mean of its divisors is an integer number (2641032).

Almost surely, 2^13205145 is an apocalyptic number.

13205145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13205145 is a deficient number, since it is larger than the sum of its proper divisors (7923111).

13205145 is an equidigital number, since it uses as much as digits as its factorization.

13205145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880351.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 13205145 is about 3633.8884132565. Note that the first 3 decimals coincide. The cubic root of 13205145 is about 236.3638515105.

Adding to 13205145 its reverse (54150231), we get a palindrome (67355376).

The spelling of 13205145 in words is "thirteen million, two hundred five thousand, one hundred forty-five".