13205431 has 4 divisors (see below), whose sum is σ = 13257072. Its totient is φ = 13153792.

The previous prime is 13205419. The next prime is 13205461. The reversal of 13205431 is 13450231.

13205431 is digitally balanced in base 3, 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: 13450231 = 173 ⋅77747.

It is a cyclic number.

It is not a de Polignac number, because 13205431 - 2⁷ = 13205303 is a prime.

It is a super-2 number, since 2×13205431² = 348766815791522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13205399 and 13205408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13205461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25435 + ... + 25948.

It is an arithmetic number, because the mean of its divisors is an integer number (3314268).

Almost surely, 2^13205431 is an apocalyptic number.

13205431 is a deficient number, since it is larger than the sum of its proper divisors (51641).

13205431 is an equidigital number, since it uses as much as digits as its factorization.

13205431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51640.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 13205431 is about 3633.9277648297. The cubic root of 13205431 is about 236.3655579053.

Adding to 13205431 its reverse (13450231), we get a palindrome (26655662).

The spelling of 13205431 in words is "thirteen million, two hundred five thousand, four hundred thirty-one".