13147231 has 4 divisors (see below), whose sum is σ = 13154832. Its totient is φ = 13139632.

The previous prime is 13147223. The next prime is 13147243. The reversal of 13147231 is 13274131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13274131 = 13 ⋅1021087.

It is a cyclic number.

It is not a de Polignac number, because 13147231 - 2³ = 13147223 is a prime.

It is a super-2 number, since 2×13147231² = 345699365934722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13147261) 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 3 ways as a sum of consecutive naturals, for example, 195 + ... + 5131.

It is an arithmetic number, because the mean of its divisors is an integer number (3288708).

Almost surely, 2^13147231 is an apocalyptic number.

13147231 is a deficient number, since it is larger than the sum of its proper divisors (7601).

13147231 is an equidigital number, since it uses as much as digits as its factorization.

13147231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7600.

The product of its digits is 504, while the sum is 22.

The square root of 13147231 is about 3625.9110579274. The cubic root of 13147231 is about 236.0178036459.

The spelling of 13147231 in words is "thirteen million, one hundred forty-seven thousand, two hundred thirty-one".