99996509 has 2 divisors, whose sum is σ = 99996510. Its totient is φ = 99996508.

The previous prime is 99996473. The next prime is 99996511. The reversal of 99996509 is 90569999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99002500 + 994009 = 9950^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 99996509 - 2¹² = 99992413 is a prime.

Together with 99996511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99996409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49998254 + 49998255.

It is an arithmetic number, because the mean of its divisors is an integer number (49998255).

Almost surely, 2^99996509 is an apocalyptic number.

It is an amenable number.

99996509 is a deficient number, since it is larger than the sum of its proper divisors (1).

99996509 is an equidigital number, since it uses as much as digits as its factorization.

99996509 is an evil number, because the sum of its binary digits is even.

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

The square root of 99996509 is about 9999.8254484766. The cubic root of 99996509 is about 464.1534820362.

The spelling of 99996509 in words is "ninety-nine million, nine hundred ninety-six thousand, five hundred nine".