3090781 has 2 divisors, whose sum is σ = 3090782. Its totient is φ = 3090780.

The previous prime is 3090779. The next prime is 3090817. The reversal of 3090781 is 1870903.

Together with next prime (3090817) 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., 2805625 + 285156 = 1675^2 + 534^2 .

It is a cyclic number.

It is not a de Polignac number, because 3090781 - 2¹ = 3090779 is a prime.

It is a super-2 number, since 2×3090781² = 19105854379922, which contains 22 as substring.

Together with 3090779, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

3090781 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3090761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1545390 + 1545391.

It is an arithmetic number, because the mean of its divisors is an integer number (1545391).

Almost surely, 2^3090781 is an apocalyptic number.

It is an amenable number.

3090781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3090781 is an equidigital number, since it uses as much as digits as its factorization.

3090781 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 3090781 is about 1758.0617167779. The cubic root of 3090781 is about 145.6652900486.

The spelling of 3090781 in words is "three million, ninety thousand, seven hundred eighty-one".