9892768381 has 2 divisors, whose sum is σ = 9892768382. Its totient is φ = 9892768380.

The previous prime is 9892768373. The next prime is 9892768439. The reversal of 9892768381 is 1838672989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9592439481 + 300328900 = 97941^2 + 17330^2 .

It is an emirp because it is prime and its reverse (1838672989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9892768381 - 2³ = 9892768373 is a prime.

It is a super-2 number, since 2×9892768381² (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 (9892766381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4946384190 + 4946384191.

It is an arithmetic number, because the mean of its divisors is an integer number (4946384191).

Almost surely, 2^9892768381 is an apocalyptic number.

It is an amenable number.

9892768381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9892768381 is an equidigital number, since it uses as much as digits as its factorization.

9892768381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 61.

The square root of 9892768381 is about 99462.3968190994. The cubic root of 9892768381 is about 2146.7062152926.

The spelling of 9892768381 in words is "nine billion, eight hundred ninety-two million, seven hundred sixty-eight thousand, three hundred eighty-one".