2181278713 has 2 divisors, whose sum is σ = 2181278714. Its totient is φ = 2181278712.

The previous prime is 2181278707. The next prime is 2181278731. The reversal of 2181278713 is 3178721812.

Together with next prime (2181278731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1100381584 + 1080897129 = 33172^2 + 32877^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181278713 - 2⁵ = 2181278681 is a prime.

It is not a weakly prime, because it can be changed into another prime (2181278753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090639356 + 1090639357.

It is an arithmetic number, because the mean of its divisors is an integer number (1090639357).

Almost surely, 2^2181278713 is an apocalyptic number.

It is an amenable number.

2181278713 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181278713 is an equidigital number, since it uses as much as digits as its factorization.

2181278713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 40.

The square root of 2181278713 is about 46704.1616239924. The cubic root of 2181278713 is about 1296.8917285522.

The spelling of 2181278713 in words is "two billion, one hundred eighty-one million, two hundred seventy-eight thousand, seven hundred thirteen".