99318221 has 2 divisors, whose sum is σ = 99318222. Its totient is φ = 99318220.

The previous prime is 99318211. The next prime is 99318229. The reversal of 99318221 is 12281399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96255721 + 3062500 = 9811^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 99318221 - 2⁶ = 99318157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99318229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49659110 + 49659111.

It is an arithmetic number, because the mean of its divisors is an integer number (49659111).

Almost surely, 2^99318221 is an apocalyptic number.

It is an amenable number.

99318221 is a deficient number, since it is larger than the sum of its proper divisors (1).

99318221 is an equidigital number, since it uses as much as digits as its factorization.

99318221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 99318221 is about 9965.8527482599. The cubic root of 99318221 is about 463.1016310694.

The spelling of 99318221 in words is "ninety-nine million, three hundred eighteen thousand, two hundred twenty-one".