9378538517 has 8 divisors (see below), whose sum is σ = 9488099160. Its totient is φ = 9269305600.

The previous prime is 9378538511. The next prime is 9378538523. The reversal of 9378538517 is 7158358739.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9378538511) and next prime (9378538523).

It can be written as a sum of positive squares in 4 ways, for example, as 5063887921 + 4314650596 = 71161^2 + 65686^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9378538517 - 2¹² = 9378534421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9378538511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24128 + ... + 139065.

It is an arithmetic number, because the mean of its divisors is an integer number (1186012395).

Almost surely, 2^9378538517 is an apocalyptic number.

It is an amenable number.

9378538517 is a deficient number, since it is larger than the sum of its proper divisors (109560643).

9378538517 is a wasteful number, since it uses less digits than its factorization.

9378538517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163863.

The product of its digits is 6350400, while the sum is 56.

The square root of 9378538517 is about 96842.8547544939. The cubic root of 9378538517 is about 2108.8469188465.

The spelling of 9378538517 in words is "nine billion, three hundred seventy-eight million, five hundred thirty-eight thousand, five hundred seventeen".