998552251 has 2 divisors, whose sum is σ = 998552252. Its totient is φ = 998552250.

The previous prime is 998552213. The next prime is 998552297. The reversal of 998552251 is 152255899.

It is a happy number.

It is an a-pointer prime, because the next prime (998552297) can be obtained adding 998552251 to its sum of digits (46).

It is a weak prime.

It is an emirp because it is prime and its reverse (152255899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998552251 - 2⁷ = 998552123 is a prime.

It is equal to p_50777866 and since 998552251 and 50777866 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (998552551) 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, 499276125 + 499276126.

It is an arithmetic number, because the mean of its divisors is an integer number (499276126).

Almost surely, 2^998552251 is an apocalyptic number.

998552251 is a deficient number, since it is larger than the sum of its proper divisors (1).

998552251 is an equidigital number, since it uses as much as digits as its factorization.

998552251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 46.

The square root of 998552251 is about 31599.8773890026. The cubic root of 998552251 is about 999.5171839262.

The spelling of 998552251 in words is "nine hundred ninety-eight million, five hundred fifty-two thousand, two hundred fifty-one".