13216431 has 16 divisors (see below), whose sum is σ = 18488160. Its totient is φ = 8386560.

The previous prime is 13216403. The next prime is 13216433. The reversal of 13216431 is 13461231.

It is not a de Polignac number, because 13216431 - 2⁷ = 13216303 is a prime.

It is a super-2 number, since 2×13216431² = 349348096755522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13216398 and 13216407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13216433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5311 + ... + 7391.

It is an arithmetic number, because the mean of its divisors is an integer number (1155510).

Almost surely, 2^13216431 is an apocalyptic number.

13216431 is a deficient number, since it is larger than the sum of its proper divisors (5271729).

13216431 is a wasteful number, since it uses less digits than its factorization.

13216431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186.

The product of its digits is 432, while the sum is 21.

The square root of 13216431 is about 3635.4409636246. The cubic root of 13216431 is about 236.4311697873.

Adding to 13216431 its reverse (13461231), we get a palindrome (26677662).

The spelling of 13216431 in words is "thirteen million, two hundred sixteen thousand, four hundred thirty-one".