13506431 has 4 divisors (see below), whose sum is σ = 13972200. Its totient is φ = 13040664.

The previous prime is 13506413. The next prime is 13506439. The reversal of 13506431 is 13460531.

It is a happy number.

13506431 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13506431 is a prime.

It is a super-2 number, since 2×13506431² = 364847356715522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13506397 and 13506406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13506439) 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, 232841 + ... + 232898.

It is an arithmetic number, because the mean of its divisors is an integer number (3493050).

Almost surely, 2^13506431 is an apocalyptic number.

13506431 is a deficient number, since it is larger than the sum of its proper divisors (465769).

13506431 is an equidigital number, since it uses as much as digits as its factorization.

13506431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465768.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 13506431 is about 3675.1096582279. The cubic root of 13506431 is about 238.1479613344.

Adding to 13506431 its reverse (13460531), we get a palindrome (26966962).

The spelling of 13506431 in words is "thirteen million, five hundred six thousand, four hundred thirty-one".