12917231 has 4 divisors (see below), whose sum is σ = 12925752. Its totient is φ = 12908712.

The previous prime is 12917221. The next prime is 12917239. The reversal of 12917231 is 13271921.

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.

It is a cyclic number.

It is not a de Polignac number, because 12917231 - 2⁶ = 12917167 is a prime.

It is a super-2 number, since 2×12917231² = 333709713414722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12917231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12917239) 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, 1301 + ... + 5246.

It is an arithmetic number, because the mean of its divisors is an integer number (3231438).

Almost surely, 2^12917231 is an apocalyptic number.

12917231 is a deficient number, since it is larger than the sum of its proper divisors (8521).

12917231 is an equidigital number, since it uses as much as digits as its factorization.

12917231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8520.

The product of its digits is 756, while the sum is 26.

The square root of 12917231 is about 3594.0549522788. The cubic root of 12917231 is about 234.6333864094.

The spelling of 12917231 in words is "twelve million, nine hundred seventeen thousand, two hundred thirty-one".