98515891 has 2 divisors, whose sum is σ = 98515892. Its totient is φ = 98515890.

The previous prime is 98515889. The next prime is 98515903. The reversal of 98515891 is 19851589.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 98515891 - 2¹ = 98515889 is a prime.

Together with 98515889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (98515801) 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, 49257945 + 49257946.

It is an arithmetic number, because the mean of its divisors is an integer number (49257946).

Almost surely, 2^98515891 is an apocalyptic number.

98515891 is the 5731-st hex number.

98515891 is a deficient number, since it is larger than the sum of its proper divisors (1).

98515891 is an equidigital number, since it uses as much as digits as its factorization.

98515891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 46.

The square root of 98515891 is about 9925.5171653673. The cubic root of 98515891 is about 461.8512214353.

The spelling of 98515891 in words is "ninety-eight million, five hundred fifteen thousand, eight hundred ninety-one".