9878397017 has 2 divisors, whose sum is σ = 9878397018. Its totient is φ = 9878397016.

The previous prime is 9878396993. The next prime is 9878397037. The reversal of 9878397017 is 7107938789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8283912256 + 1594484761 = 91016^2 + 39931^2 .

It is a cyclic number.

It is not a de Polignac number, because 9878397017 - 2⁶ = 9878396953 is a prime.

It is not a weakly prime, because it can be changed into another prime (9878397037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4939198508 + 4939198509.

It is an arithmetic number, because the mean of its divisors is an integer number (4939198509).

Almost surely, 2^9878397017 is an apocalyptic number.

It is an amenable number.

9878397017 is a deficient number, since it is larger than the sum of its proper divisors (1).

9878397017 is an equidigital number, since it uses as much as digits as its factorization.

9878397017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5334336, while the sum is 59.

The square root of 9878397017 is about 99390.1253495537. The cubic root of 9878397017 is about 2145.6661947249. Note that the first 3 decimals are identical.

The spelling of 9878397017 in words is "nine billion, eight hundred seventy-eight million, three hundred ninety-seven thousand, seventeen".