3785880781 has 2 divisors, whose sum is σ = 3785880782. Its totient is φ = 3785880780.

The previous prime is 3785880751. The next prime is 3785880817. The reversal of 3785880781 is 1870885873.

Together with next prime (3785880817) 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., 3303375625 + 482505156 = 57475^2 + 21966^2 .

It is an emirp because it is prime and its reverse (1870885873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3785880781 - 2⁷ = 3785880653 is a prime.

It is a super-2 number, since 2×3785880781² = 28665786575890339922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3785880731) 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, 1892940390 + 1892940391.

It is an arithmetic number, because the mean of its divisors is an integer number (1892940391).

Almost surely, 2^3785880781 is an apocalyptic number.

It is an amenable number.

3785880781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3785880781 is an equidigital number, since it uses as much as digits as its factorization.

3785880781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3010560, while the sum is 55.

The square root of 3785880781 is about 61529.5114640121. The cubic root of 3785880781 is about 1558.5556405761. Note that the first 3 decimals are identical.

The spelling of 3785880781 in words is "three billion, seven hundred eighty-five million, eight hundred eighty thousand, seven hundred eighty-one".