8917978513 has 2 divisors, whose sum is σ = 8917978514. Its totient is φ = 8917978512.

The previous prime is 8917978477. The next prime is 8917978549. The reversal of 8917978513 is 3158797198.

It is a balanced prime because it is at equal distance from previous prime (8917978477) and next prime (8917978549).

It can be written as a sum of positive squares in only one way, i.e., 8108462209 + 809516304 = 90047^2 + 28452^2 .

It is a cyclic number.

It is not a de Polignac number, because 8917978513 - 2⁹ = 8917978001 is a prime.

It is not a weakly prime, because it can be changed into another prime (8917972513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4458989256 + 4458989257.

It is an arithmetic number, because the mean of its divisors is an integer number (4458989257).

Almost surely, 2^8917978513 is an apocalyptic number.

It is an amenable number.

8917978513 is a deficient number, since it is larger than the sum of its proper divisors (1).

8917978513 is an equidigital number, since it uses as much as digits as its factorization.

8917978513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 58.

The square root of 8917978513 is about 94435.0491766696. The cubic root of 8917978513 is about 2073.7455823905.

The spelling of 8917978513 in words is "eight billion, nine hundred seventeen million, nine hundred seventy-eight thousand, five hundred thirteen".