12817931 has 4 divisors (see below), whose sum is σ = 14649072. Its totient is φ = 10986792.

The previous prime is 12817921. The next prime is 12817933. The reversal of 12817931 is 13971821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13971821 = 19 ⋅735359.

It is a cyclic number.

It is not a de Polignac number, because 12817931 - 2⁶ = 12817867 is a prime.

It is a super-3 number, since 3×12817931³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12817933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915560 + ... + 915573.

It is an arithmetic number, because the mean of its divisors is an integer number (3662268).

Almost surely, 2^12817931 is an apocalyptic number.

12817931 is a deficient number, since it is larger than the sum of its proper divisors (1831141).

12817931 is an equidigital number, since it uses as much as digits as its factorization.

12817931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831140.

The product of its digits is 3024, while the sum is 32.

The square root of 12817931 is about 3580.2138204303. The cubic root of 12817931 is about 234.0305984289.

The spelling of 12817931 in words is "twelve million, eight hundred seventeen thousand, nine hundred thirty-one".