99228209 has 2 divisors, whose sum is σ = 99228210. Its totient is φ = 99228208.

The previous prime is 99228197. The next prime is 99228211. The reversal of 99228209 is 90282299.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67699984 + 31528225 = 8228^2 + 5615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99228209 is a prime.

It is a super-2 number, since 2×99228209² = 19692474922695362, which contains 22 as substring.

Together with 99228211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99228229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49614104 + 49614105.

It is an arithmetic number, because the mean of its divisors is an integer number (49614105).

Almost surely, 2^99228209 is an apocalyptic number.

It is an amenable number.

99228209 is a deficient number, since it is larger than the sum of its proper divisors (1).

99228209 is an equidigital number, since it uses as much as digits as its factorization.

99228209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 99228209 is about 9961.3357036092. The cubic root of 99228209 is about 462.9616859419.

The spelling of 99228209 in words is "ninety-nine million, two hundred twenty-eight thousand, two hundred nine".