98555591 has 2 divisors, whose sum is σ = 98555592. Its totient is φ = 98555590.

The previous prime is 98555521. The next prime is 98555609. The reversal of 98555591 is 19555589.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 98555591 - 2¹⁰ = 98554567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98555521) 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, 49277795 + 49277796.

It is an arithmetic number, because the mean of its divisors is an integer number (49277796).

Almost surely, 2^98555591 is an apocalyptic number.

98555591 is a deficient number, since it is larger than the sum of its proper divisors (1).

98555591 is an equidigital number, since it uses as much as digits as its factorization.

98555591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 405000, while the sum is 47.

The square root of 98555591 is about 9927.5168597187. The cubic root of 98555591 is about 461.9132521422.

The spelling of 98555591 in words is "ninety-eight million, five hundred fifty-five thousand, five hundred ninety-one".