12847097981 has 4 divisors (see below), whose sum is σ = 12883909500. Its totient is φ = 12810286464.

The previous prime is 12847097959. The next prime is 12847097983. The reversal of 12847097981 is 18979074821.

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 4989161956 + 7857936025 = 70634^2 + 88645^2 .

It is a cyclic number.

It is not a de Polignac number, because 12847097981 - 2¹⁰ = 12847096957 is a prime.

It is a super-2 number, since 2×12847097981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12847097983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18405236 + ... + 18405933.

It is an arithmetic number, because the mean of its divisors is an integer number (3220977375).

Almost surely, 2^12847097981 is an apocalyptic number.

It is an amenable number.

12847097981 is a deficient number, since it is larger than the sum of its proper divisors (36811519).

12847097981 is an equidigital number, since it uses as much as digits as its factorization.

12847097981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36811518.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The spelling of 12847097981 in words is "twelve billion, eight hundred forty-seven million, ninety-seven thousand, nine hundred eighty-one".