2684944781 has 2 divisors, whose sum is σ = 2684944782. Its totient is φ = 2684944780.

The previous prime is 2684944747. The next prime is 2684944837. The reversal of 2684944781 is 1874494862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2514119881 + 170824900 = 50141^2 + 13070^2 .

It is a cyclic number.

It is not a de Polignac number, because 2684944781 - 2¹⁰ = 2684943757 is a prime.

It is a super-2 number, since 2×2684944781² = 14417856954038275922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2684934781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342472390 + 1342472391.

It is an arithmetic number, because the mean of its divisors is an integer number (1342472391).

Almost surely, 2^2684944781 is an apocalyptic number.

It is an amenable number.

2684944781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2684944781 is an equidigital number, since it uses as much as digits as its factorization.

2684944781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 53.

The square root of 2684944781 is about 51816.4528021747. The cubic root of 2684944781 is about 1389.8836714062.

The spelling of 2684944781 in words is "two billion, six hundred eighty-four million, nine hundred forty-four thousand, seven hundred eighty-one".