999888559 has 2 divisors, whose sum is σ = 999888560. Its totient is φ = 999888558.

The previous prime is 999888557. The next prime is 999888581. The reversal of 999888559 is 955888999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999888559 - 2¹ = 999888557 is a prime.

Together with 999888557, 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 (999888557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499944279 + 499944280.

It is an arithmetic number, because the mean of its divisors is an integer number (499944280).

Almost surely, 2^999888559 is an apocalyptic number.

999888559 is a deficient number, since it is larger than the sum of its proper divisors (1).

999888559 is an equidigital number, since it uses as much as digits as its factorization.

999888559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83980800, while the sum is 70.

The square root of 999888559 is about 31621.0145156666. The cubic root of 999888559 is about 999.9628516200.

The spelling of 999888559 in words is "nine hundred ninety-nine million, eight hundred eighty-eight thousand, five hundred fifty-nine".