12820931 has 4 divisors (see below), whose sum is σ = 12830664. Its totient is φ = 12811200.

The previous prime is 12820909. The next prime is 12820937. The reversal of 12820931 is 13902821.

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 12820931 - 2¹⁰ = 12819907 is a prime.

It is a super-4 number, since 4×12820931⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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 12820931.

It is not an unprimeable number, because it can be changed into a prime (12820937) 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, 2510 + ... + 5651.

It is an arithmetic number, because the mean of its divisors is an integer number (3207666).

Almost surely, 2^12820931 is an apocalyptic number.

12820931 is a deficient number, since it is larger than the sum of its proper divisors (9733).

12820931 is an equidigital number, since it uses as much as digits as its factorization.

12820931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9732.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 12820931 is about 3580.6327653084. The cubic root of 12820931 is about 234.0488550682.

The spelling of 12820931 in words is "twelve million, eight hundred twenty thousand, nine hundred thirty-one".