998161 has 2 divisors, whose sum is σ = 998162. Its totient is φ = 998160.

The previous prime is 998147. The next prime is 998167. The reversal of 998161 is 161899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 801025 + 197136 = 895^2 + 444^2 .

It is a cyclic number.

It is not a de Polignac number, because 998161 - 2⁹ = 997649 is a prime.

998161 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (998167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499080 + 499081.

It is an arithmetic number, because the mean of its divisors is an integer number (499081).

2⁹⁹⁸¹⁶¹ is an apocalyptic number.

It is an amenable number.

998161 is a deficient number, since it is larger than the sum of its proper divisors (1).

998161 is an equidigital number, since it uses as much as digits as its factorization.

998161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 34.

The square root of 998161 is about 999.0800768707. The cubic root of 998161 is about 99.9386623847.

The spelling of 998161 in words is "nine hundred ninety-eight thousand, one hundred sixty-one".