99209969 has 2 divisors, whose sum is σ = 99209970. Its totient is φ = 99209968.

The previous prime is 99209953. The next prime is 99209989. The reversal of 99209969 is 96990299.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75082225 + 24127744 = 8665^2 + 4912^2 .

It is a cyclic number.

It is not a de Polignac number, because 99209969 - 2⁴ = 99209953 is a prime.

It is a super-2 number, since 2×99209969² = 19685235897961922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 99209969.

It is not a weakly prime, because it can be changed into another prime (99209989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49604984 + 49604985.

It is an arithmetic number, because the mean of its divisors is an integer number (49604985).

Almost surely, 2^99209969 is an apocalyptic number.

It is an amenable number.

99209969 is a deficient number, since it is larger than the sum of its proper divisors (1).

99209969 is an equidigital number, since it uses as much as digits as its factorization.

99209969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 708588, while the sum is 53.

The square root of 99209969 is about 9960.4201216615. The cubic root of 99209969 is about 462.9333171991.

The spelling of 99209969 in words is "ninety-nine million, two hundred nine thousand, nine hundred sixty-nine".