998623159 has 2 divisors, whose sum is σ = 998623160. Its totient is φ = 998623158.

The previous prime is 998623127. The next prime is 998623187. The reversal of 998623159 is 951326899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998623159 - 2⁵ = 998623127 is a prime.

It is a super-2 number, since 2×998623159² = 1994496427382278562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998623559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499311579 + 499311580.

It is an arithmetic number, because the mean of its divisors is an integer number (499311580).

Almost surely, 2^998623159 is an apocalyptic number.

998623159 is a deficient number, since it is larger than the sum of its proper divisors (1).

998623159 is an equidigital number, since it uses as much as digits as its factorization.

998623159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 52.

The square root of 998623159 is about 31600.9993354641. Note that the first 3 decimals coincide. The cubic root of 998623159 is about 999.5408422064.

The spelling of 998623159 in words is "nine hundred ninety-eight million, six hundred twenty-three thousand, one hundred fifty-nine".