999989017 has 2 divisors, whose sum is σ = 999989018. Its totient is φ = 999989016.

The previous prime is 999988987. The next prime is 999989033. The reversal of 999989017 is 710989999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670602816 + 329386201 = 25896^2 + 18149^2 .

It is an emirp because it is prime and its reverse (710989999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999989017 is a prime.

It is not a weakly prime, because it can be changed into another prime (999989087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499994508 + 499994509.

It is an arithmetic number, because the mean of its divisors is an integer number (499994509).

Almost surely, 2^999989017 is an apocalyptic number.

It is an amenable number.

999989017 is a deficient number, since it is larger than the sum of its proper divisors (1).

999989017 is an equidigital number, since it uses as much as digits as its factorization.

999989017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 61.

The square root of 999989017 is about 31622.6029447293. The cubic root of 999989017 is about 999.9963389866.

The spelling of 999989017 in words is "nine hundred ninety-nine million, nine hundred eighty-nine thousand, seventeen".