9138978943 has 2 divisors, whose sum is σ = 9138978944. Its totient is φ = 9138978942.

The previous prime is 9138978941. The next prime is 9138978977. The reversal of 9138978943 is 3498798319.

It is a weak prime.

It is an emirp because it is prime and its reverse (3498798319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9138978943 - 2¹ = 9138978941 is a prime.

It is a super-2 number, since 2×9138978943² (a number of 21 digits) contains 22 as substring.

Together with 9138978941, 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 (9138978941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4569489471 + 4569489472.

It is an arithmetic number, because the mean of its divisors is an integer number (4569489472).

Almost surely, 2^9138978943 is an apocalyptic number.

9138978943 is a deficient number, since it is larger than the sum of its proper divisors (1).

9138978943 is an equidigital number, since it uses as much as digits as its factorization.

9138978943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 61.

The square root of 9138978943 is about 95598.0070032843. The cubic root of 9138978943 is about 2090.7361358419.

The spelling of 9138978943 in words is "nine billion, one hundred thirty-eight million, nine hundred seventy-eight thousand, nine hundred forty-three".