2685335981 has 2 divisors, whose sum is σ = 2685335982. Its totient is φ = 2685335980.

The previous prime is 2685335977. The next prime is 2685336011. The reversal of 2685335981 is 1895335862.

2685335981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2625025225 + 60310756 = 51235^2 + 7766^2 .

It is a cyclic number.

It is not a de Polignac number, because 2685335981 - 2² = 2685335977 is a prime.

It is a super-2 number, since 2×2685335981² = 14422058661706464722, which 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 (2685335921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342667990 + 1342667991.

It is an arithmetic number, because the mean of its divisors is an integer number (1342667991).

Almost surely, 2^2685335981 is an apocalyptic number.

It is an amenable number.

2685335981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2685335981 is an equidigital number, since it uses as much as digits as its factorization.

2685335981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 50.

The square root of 2685335981 is about 51820.2275274820. The cubic root of 2685335981 is about 1389.9511707568.

The spelling of 2685335981 in words is "two billion, six hundred eighty-five million, three hundred thirty-five thousand, nine hundred eighty-one".