13222431 has 24 divisors (see below), whose sum is σ = 19977360. Its totient is φ = 8418816.

The previous prime is 13222427. The next prime is 13222439. The reversal of 13222431 is 13422231.

13222431 is a `hidden beast` number, since 13 + 222 + 431 = 666.

13222431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13222431 - 2² = 13222427 is a prime.

It is a super-2 number, since 2×13222431² = 349665363099522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13222439) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19311 + ... + 19983.

It is an arithmetic number, because the mean of its divisors is an integer number (832390).

Almost surely, 2^13222431 is an apocalyptic number.

13222431 is a deficient number, since it is larger than the sum of its proper divisors (6754929).

13222431 is a wasteful number, since it uses less digits than its factorization.

13222431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 772 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 13222431 is about 3636.2660793732. The cubic root of 13222431 is about 236.4669427430.

Adding to 13222431 its reverse (13422231), we get a palindrome (26644662).

The spelling of 13222431 in words is "thirteen million, two hundred twenty-two thousand, four hundred thirty-one".