13209231 has 8 divisors (see below), whose sum is σ = 20128384. Its totient is φ = 7548120.

The previous prime is 13209227. The next prime is 13209241. The reversal of 13209231 is 13290231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13209231 - 2² = 13209227 is a prime.

It is a super-2 number, since 2×13209231² = 348967567222722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 629011 = 13209231 / (1 + 3 + 2 + 0 + 9 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13209198 and 13209207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13209211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314485 + ... + 314526.

It is an arithmetic number, because the mean of its divisors is an integer number (2516048).

Almost surely, 2^13209231 is an apocalyptic number.

13209231 is a deficient number, since it is larger than the sum of its proper divisors (6919153).

13209231 is an equidigital number, since it uses as much as digits as its factorization.

13209231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629021.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 13209231 is about 3634.4505774601. The cubic root of 13209231 is about 236.3882279461.

Adding to 13209231 its reverse (13290231), we get a palindrome (26499462).

The spelling of 13209231 in words is "thirteen million, two hundred nine thousand, two hundred thirty-one".