12831994397 has 4 divisors (see below), whose sum is σ = 12833351676. Its totient is φ = 12830637120.

The previous prime is 12831994391. The next prime is 12831994463. The reversal of 12831994397 is 79349913821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9143375641 + 3688618756 = 95621^2 + 60734^2 .

It is a cyclic number.

It is not a de Polignac number, because 12831994397 - 2⁴ = 12831994381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12831994391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664358 + ... + 683399.

It is an arithmetic number, because the mean of its divisors is an integer number (3208337919).

Almost surely, 2^12831994397 is an apocalyptic number.

It is an amenable number.

12831994397 is a deficient number, since it is larger than the sum of its proper divisors (1357279).

12831994397 is an equidigital number, since it uses as much as digits as its factorization.

12831994397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357278.

The product of its digits is 2939328, while the sum is 56.

The spelling of 12831994397 in words is "twelve billion, eight hundred thirty-one million, nine hundred ninety-four thousand, three hundred ninety-seven".