9281778013393 has 2 divisors, whose sum is σ = 9281778013394. Its totient is φ = 9281778013392.

The previous prime is 9281778013379. The next prime is 9281778013433. The reversal of 9281778013393 is 3933108771829.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5417754346449 + 3864023666944 = 2327607^2 + 1965712^2 .

It is an emirp because it is prime and its reverse (3933108771829) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9281778013393 is a prime.

It is not a weakly prime, because it can be changed into another prime (9281778013373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4640889006696 + 4640889006697.

It is an arithmetic number, because the mean of its divisors is an integer number (4640889006697).

Almost surely, 2^{9281778013393} is an apocalyptic number.

It is an amenable number.

9281778013393 is a deficient number, since it is larger than the sum of its proper divisors (1).

9281778013393 is an equidigital number, since it uses as much as digits as its factorization.

9281778013393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13716864, while the sum is 61.

The spelling of 9281778013393 in words is "nine trillion, two hundred eighty-one billion, seven hundred seventy-eight million, thirteen thousand, three hundred ninety-three".