998368909 has 2 divisors, whose sum is σ = 998368910. Its totient is φ = 998368908.

The previous prime is 998368879. The next prime is 998368937. The reversal of 998368909 is 909863899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 941139684 + 57229225 = 30678^2 + 7565^2 .

It is a cyclic number.

It is not a de Polignac number, because 998368909 - 2²⁷ = 864151181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998368949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499184454 + 499184455.

It is an arithmetic number, because the mean of its divisors is an integer number (499184455).

Almost surely, 2^998368909 is an apocalyptic number.

It is an amenable number.

998368909 is a deficient number, since it is larger than the sum of its proper divisors (1).

998368909 is an equidigital number, since it uses as much as digits as its factorization.

998368909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7558272, while the sum is 61.

The square root of 998368909 is about 31596.9762635604. The cubic root of 998368909 is about 999.4560071254.

The spelling of 998368909 in words is "nine hundred ninety-eight million, three hundred sixty-eight thousand, nine hundred nine".