98816821 has 2 divisors, whose sum is σ = 98816822. Its totient is φ = 98816820.

The previous prime is 98816807. The next prime is 98816827. The reversal of 98816821 is 12861889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79014321 + 19802500 = 8889^2 + 4450^2 .

It is an emirp because it is prime and its reverse (12861889) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98816821 - 2⁷ = 98816693 is a prime.

It is a super-2 number, since 2×98816821² = 19529528225092082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98816827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49408410 + 49408411.

It is an arithmetic number, because the mean of its divisors is an integer number (49408411).

Almost surely, 2^98816821 is an apocalyptic number.

It is an amenable number.

98816821 is a deficient number, since it is larger than the sum of its proper divisors (1).

98816821 is an equidigital number, since it uses as much as digits as its factorization.

98816821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 43.

The square root of 98816821 is about 9940.6650179955. The cubic root of 98816821 is about 462.3210055832.

The spelling of 98816821 in words is "ninety-eight million, eight hundred sixteen thousand, eight hundred twenty-one".