99609509 has 2 divisors, whose sum is σ = 99609510. Its totient is φ = 99609508.

The previous prime is 99609437. The next prime is 99609547. The reversal of 99609509 is 90590699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90307009 + 9302500 = 9503^2 + 3050^2 .

It is an emirp because it is prime and its reverse (90590699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99609509 - 2⁸ = 99609253 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99609589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49804754 + 49804755.

It is an arithmetic number, because the mean of its divisors is an integer number (49804755).

Almost surely, 2^99609509 is an apocalyptic number.

It is an amenable number.

99609509 is a deficient number, since it is larger than the sum of its proper divisors (1).

99609509 is an equidigital number, since it uses as much as digits as its factorization.

99609509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196830, while the sum is 47.

The square root of 99609509 is about 9980.4563522917. The cubic root of 99609509 is about 463.5539290242.

The spelling of 99609509 in words is "ninety-nine million, six hundred nine thousand, five hundred nine".