999998959 has 2 divisors, whose sum is σ = 999998960. Its totient is φ = 999998958.

The previous prime is 999998957. The next prime is 999998971. The reversal of 999998959 is 959899999.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (959899999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999998959 - 2¹ = 999998957 is a prime.

Together with 999998957, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999998957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999479 + 499999480.

It is an arithmetic number, because the mean of its divisors is an integer number (499999480).

Almost surely, 2^999998959 is an apocalyptic number.

999998959 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998959 is an equidigital number, since it uses as much as digits as its factorization.

999998959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 191318760, while the sum is 76.

The square root of 999998959 is about 31622.7601420243. The cubic root of 999998959 is about 999.9996529999. Note that the first 3 decimals are identical.

The spelling of 999998959 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, nine hundred fifty-nine".