998345599 has 2 divisors, whose sum is σ = 998345600. Its totient is φ = 998345598.

The previous prime is 998345597. The next prime is 998345611. The reversal of 998345599 is 995543899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998345599 - 2¹ = 998345597 is a prime.

Together with 998345597, 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 (998345597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499172799 + 499172800.

It is an arithmetic number, because the mean of its divisors is an integer number (499172800).

Almost surely, 2^998345599 is an apocalyptic number.

998345599 is a deficient number, since it is larger than the sum of its proper divisors (1).

998345599 is an equidigital number, since it uses as much as digits as its factorization.

998345599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15746400, while the sum is 61.

The square root of 998345599 is about 31596.6073969975. The cubic root of 998345599 is about 999.4482286043.

The spelling of 998345599 in words is "nine hundred ninety-eight million, three hundred forty-five thousand, five hundred ninety-nine".