9000781 has 2 divisors, whose sum is σ = 9000782. Its totient is φ = 9000780.

The previous prime is 9000779. The next prime is 9000787. The reversal of 9000781 is 1870009.

9000781 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., 5447556 + 3553225 = 2334^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 9000781 - 2¹ = 9000779 is a prime.

It is a super-2 number, since 2×9000781² = 162028117219922, which contains 22 as substring.

Together with 9000779, 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 (9000787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500390 + 4500391.

It is an arithmetic number, because the mean of its divisors is an integer number (4500391).

Almost surely, 2^9000781 is an apocalyptic number.

It is an amenable number.

9000781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9000781 is an equidigital number, since it uses as much as digits as its factorization.

9000781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 9000781 is about 3000.1301638429. The cubic root of 9000781 is about 208.0143989662.

The spelling of 9000781 in words is "nine million, seven hundred eighty-one", and thus it is an aban number.