65781113 has 2 divisors, whose sum is σ = 65781114. Its totient is φ = 65781112.

The previous prime is 65781091. The next prime is 65781169. The reversal of 65781113 is 31118756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65334889 + 446224 = 8083^2 + 668^2 .

It is a cyclic number.

It is not a de Polignac number, because 65781113 - 2⁶ = 65781049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65781113.

It is not a weakly prime, because it can be changed into another prime (65781613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32890556 + 32890557.

It is an arithmetic number, because the mean of its divisors is an integer number (32890557).

Almost surely, 2^65781113 is an apocalyptic number.

It is an amenable number.

65781113 is a deficient number, since it is larger than the sum of its proper divisors (1).

65781113 is an equidigital number, since it uses as much as digits as its factorization.

65781113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 65781113 is about 8110.5556529747. Note that the first 3 decimals coincide. The cubic root of 65781113 is about 403.6767522649.

Adding to 65781113 its reverse (31118756), we get a palindrome (96899869).

The spelling of 65781113 in words is "sixty-five million, seven hundred eighty-one thousand, one hundred thirteen".