998306563 has 2 divisors, whose sum is σ = 998306564. Its totient is φ = 998306562.

The previous prime is 998306557. The next prime is 998306587. The reversal of 998306563 is 365603899.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998306563 is a prime.

It is not a weakly prime, because it can be changed into another prime (998306593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499153281 + 499153282.

It is an arithmetic number, because the mean of its divisors is an integer number (499153282).

Almost surely, 2^998306563 is an apocalyptic number.

998306563 is a deficient number, since it is larger than the sum of its proper divisors (1).

998306563 is an equidigital number, since it uses as much as digits as its factorization.

998306563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 49.

The square root of 998306563 is about 31595.9896664118. The cubic root of 998306563 is about 999.4352020633.

The spelling of 998306563 in words is "nine hundred ninety-eight million, three hundred six thousand, five hundred sixty-three".