3061781 has 2 divisors, whose sum is σ = 3061782. Its totient is φ = 3061780.

The previous prime is 3061763. The next prime is 3061811. The reversal of 3061781 is 1871603.

3061781 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., 2775556 + 286225 = 1666^2 + 535^2 .

It is an emirp because it is prime and its reverse (1871603) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3061781 - 2¹⁸ = 2799637 is a prime.

It is a super-2 number, since 2×3061781² = 18749005783922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3061781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3061181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1530890 + 1530891.

It is an arithmetic number, because the mean of its divisors is an integer number (1530891).

Almost surely, 2^3061781 is an apocalyptic number.

It is an amenable number.

3061781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3061781 is an equidigital number, since it uses as much as digits as its factorization.

3061781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 3061781 is about 1749.7945593698. The cubic root of 3061781 is about 145.2082777776.

The spelling of 3061781 in words is "three million, sixty-one thousand, seven hundred eighty-one".