13431211 has 4 divisors (see below), whose sum is σ = 13450032. Its totient is φ = 13412392.

The previous prime is 13431191. The next prime is 13431217. The reversal of 13431211 is 11213431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11213431 = 2741 ⋅4091.

It is a cyclic number.

It is not a de Polignac number, because 13431211 - 2⁹ = 13430699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13431217) 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, 8296 + ... + 9781.

It is an arithmetic number, because the mean of its divisors is an integer number (3362508).

Almost surely, 2^13431211 is an apocalyptic number.

13431211 is a deficient number, since it is larger than the sum of its proper divisors (18821).

13431211 is an equidigital number, since it uses as much as digits as its factorization.

13431211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18820.

The product of its digits is 72, while the sum is 16.

The square root of 13431211 is about 3664.8616617821. The cubic root of 13431211 is about 237.7050402913.

Adding to 13431211 its reverse (11213431), we get a palindrome (24644642).

The spelling of 13431211 in words is "thirteen million, four hundred thirty-one thousand, two hundred eleven".