3009781 has 2 divisors, whose sum is σ = 3009782. Its totient is φ = 3009780.

The previous prime is 3009779. The next prime is 3009827. The reversal of 3009781 is 1879003.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3006756 + 3025 = 1734^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 3009781 - 2¹ = 3009779 is a prime.

It is a super-2 number, since 2×3009781² = 18117563335922, which contains 22 as substring.

Together with 3009779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3009701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1504890 + 1504891.

It is an arithmetic number, because the mean of its divisors is an integer number (1504891).

Almost surely, 2^3009781 is an apocalyptic number.

It is an amenable number.

3009781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3009781 is an equidigital number, since it uses as much as digits as its factorization.

3009781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 3009781 is about 1734.8720413909. The cubic root of 3009781 is about 144.3815274748.

The spelling of 3009781 in words is "three million, nine thousand, seven hundred eighty-one".