998728177 has 2 divisors, whose sum is σ = 998728178. Its totient is φ = 998728176.

The previous prime is 998728163. The next prime is 998728229. The reversal of 998728177 is 771827899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998623201 + 104976 = 31601^2 + 324^2 .

It is a cyclic number.

It is not a de Polignac number, because 998728177 - 2¹⁵ = 998695409 is a prime.

It is not a weakly prime, because it can be changed into another prime (998728777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499364088 + 499364089.

It is an arithmetic number, because the mean of its divisors is an integer number (499364089).

Almost surely, 2^998728177 is an apocalyptic number.

It is an amenable number.

998728177 is a deficient number, since it is larger than the sum of its proper divisors (1).

998728177 is an equidigital number, since it uses as much as digits as its factorization.

998728177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 58.

The square root of 998728177 is about 31602.6609164482. The cubic root of 998728177 is about 999.5758791469.

The spelling of 998728177 in words is "nine hundred ninety-eight million, seven hundred twenty-eight thousand, one hundred seventy-seven".