98815993 has 2 divisors, whose sum is σ = 98815994. Its totient is φ = 98815992.

The previous prime is 98815991. The next prime is 98816041. The reversal of 98815993 is 39951889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81866304 + 16949689 = 9048^2 + 4117^2 .

It is a cyclic number.

It is not a de Polignac number, because 98815993 - 2¹ = 98815991 is a prime.

Together with 98815991, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 98815993.

It is not a weakly prime, because it can be changed into another prime (98815991) 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, 49407996 + 49407997.

It is an arithmetic number, because the mean of its divisors is an integer number (49407997).

Almost surely, 2^98815993 is an apocalyptic number.

It is an amenable number.

98815993 is a deficient number, since it is larger than the sum of its proper divisors (1).

98815993 is an equidigital number, since it uses as much as digits as its factorization.

98815993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 52.

The square root of 98815993 is about 9940.6233707952. The cubic root of 98815993 is about 462.3197142955.

The spelling of 98815993 in words is "ninety-eight million, eight hundred fifteen thousand, nine hundred ninety-three".