9381084781 has 2 divisors, whose sum is σ = 9381084782. Its totient is φ = 9381084780.

The previous prime is 9381084707. The next prime is 9381084787. The reversal of 9381084781 is 1874801839.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8933085225 + 447999556 = 94515^2 + 21166^2 .

It is a cyclic number.

It is not a de Polignac number, because 9381084781 - 2²⁷ = 9246867053 is a prime.

It is a super-2 number, since 2×9381084781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9381084787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4690542390 + 4690542391.

It is an arithmetic number, because the mean of its divisors is an integer number (4690542391).

Almost surely, 2^9381084781 is an apocalyptic number.

It is an amenable number.

9381084781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9381084781 is an equidigital number, since it uses as much as digits as its factorization.

9381084781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 49.

The square root of 9381084781 is about 96856.0002323036. Note that the first 3 decimals coincide. The cubic root of 9381084781 is about 2109.0377515333.

The spelling of 9381084781 in words is "nine billion, three hundred eighty-one million, eighty-four thousand, seven hundred eighty-one".