99909569 has 2 divisors, whose sum is σ = 99909570. Its totient is φ = 99909568.

The previous prime is 99909533. The next prime is 99909571. The reversal of 99909569 is 96590999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53465344 + 46444225 = 7312^2 + 6815^2 .

It is a cyclic number.

It is not a de Polignac number, because 99909569 - 2¹² = 99905473 is a prime.

It is a super-2 number, since 2×99909569² = 19963843955531522, which contains 22 as substring.

Together with 99909571, 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 (99909599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49954784 + 49954785.

It is an arithmetic number, because the mean of its divisors is an integer number (49954785).

Almost surely, 2^99909569 is an apocalyptic number.

It is an amenable number.

99909569 is a deficient number, since it is larger than the sum of its proper divisors (1).

99909569 is an equidigital number, since it uses as much as digits as its factorization.

99909569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1771470, while the sum is 56.

The square root of 99909569 is about 9995.4774273168. The cubic root of 99909569 is about 464.0189266581.

The spelling of 99909569 in words is "ninety-nine million, nine hundred nine thousand, five hundred sixty-nine".