99963209 has 2 divisors, whose sum is σ = 99963210. Its totient is φ = 99963208.

The previous prime is 99963167. The next prime is 99963211. The reversal of 99963209 is 90236999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99102025 + 861184 = 9955^2 + 928^2 .

It is a cyclic number.

It is not a de Polignac number, because 99963209 - 2⁸ = 99962953 is a prime.

Together with 99963211, 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 (99963509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49981604 + 49981605.

It is an arithmetic number, because the mean of its divisors is an integer number (49981605).

Almost surely, 2^99963209 is an apocalyptic number.

It is an amenable number.

99963209 is a deficient number, since it is larger than the sum of its proper divisors (1).

99963209 is an equidigital number, since it uses as much as digits as its factorization.

99963209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 47.

The square root of 99963209 is about 9998.1602807717. The cubic root of 99963209 is about 464.1019534808.

The spelling of 99963209 in words is "ninety-nine million, nine hundred sixty-three thousand, two hundred nine".