998177903 has 2 divisors, whose sum is σ = 998177904. Its totient is φ = 998177902.

The previous prime is 998177891. The next prime is 998177909. The reversal of 998177903 is 309771899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998177903 - 2¹⁴ = 998161519 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998177909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499088951 + 499088952.

It is an arithmetic number, because the mean of its divisors is an integer number (499088952).

Almost surely, 2^998177903 is an apocalyptic number.

998177903 is a deficient number, since it is larger than the sum of its proper divisors (1).

998177903 is an equidigital number, since it uses as much as digits as its factorization.

998177903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 998177903 is about 31593.9535829247. The cubic root of 998177903 is about 999.3922650664.

The spelling of 998177903 in words is "nine hundred ninety-eight million, one hundred seventy-seven thousand, nine hundred three".