999998617 has 2 divisors, whose sum is σ = 999998618. Its totient is φ = 999998616.

The previous prime is 999998609. The next prime is 999998621. The reversal of 999998617 is 716899999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 987153561 + 12845056 = 31419^2 + 3584^2 .

It is a cyclic number.

It is not a de Polignac number, because 999998617 - 2³ = 999998609 is a prime.

It is a super-3 number, since 3×999998617³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (999998627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999308 + 499999309.

It is an arithmetic number, because the mean of its divisors is an integer number (499999309).

Almost surely, 2^999998617 is an apocalyptic number.

It is an amenable number.

999998617 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998617 is an equidigital number, since it uses as much as digits as its factorization.

999998617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19840464, while the sum is 67.

The square root of 999998617 is about 31622.7547345262. The cubic root of 999998617 is about 999.9995389998. Note that the first 3 decimals are identical.

The spelling of 999998617 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, six hundred seventeen".