99998551 has 2 divisors, whose sum is σ = 99998552. Its totient is φ = 99998550.

The previous prime is 99998543. The next prime is 99998557. The reversal of 99998551 is 15589999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99998551 - 2³ = 99998543 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99998492 and 99998501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99998557) 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, 49999275 + 49999276.

It is an arithmetic number, because the mean of its divisors is an integer number (49999276).

Almost surely, 2^99998551 is an apocalyptic number.

99998551 is a deficient number, since it is larger than the sum of its proper divisors (1).

99998551 is an equidigital number, since it uses as much as digits as its factorization.

99998551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1312200, while the sum is 55.

The square root of 99998551 is about 9999.9275497375. The cubic root of 99998551 is about 464.1566414630.

The spelling of 99998551 in words is "ninety-nine million, nine hundred ninety-eight thousand, five hundred fifty-one".