12947833781 has 2 divisors, whose sum is σ = 12947833782. Its totient is φ = 12947833780.

The previous prime is 12947833771. The next prime is 12947833823. The reversal of 12947833781 is 18733874921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12513778225 + 434055556 = 111865^2 + 20834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12947833781 is a prime.

It is a super-2 number, since 2×12947833781² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12947833771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6473916890 + 6473916891.

It is an arithmetic number, because the mean of its divisors is an integer number (6473916891).

Almost surely, 2^12947833781 is an apocalyptic number.

It is an amenable number.

12947833781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12947833781 is an equidigital number, since it uses as much as digits as its factorization.

12947833781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 53.

The spelling of 12947833781 in words is "twelve billion, nine hundred forty-seven million, eight hundred thirty-three thousand, seven hundred eighty-one".