99609691 has 2 divisors, whose sum is σ = 99609692. Its totient is φ = 99609690.

The previous prime is 99609689. The next prime is 99609707. The reversal of 99609691 is 19690699.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99609691 - 2¹ = 99609689 is a prime.

It is a super-2 number, since 2×99609691² = 19844181082230962, which contains 22 as substring.

Together with 99609689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99609611) 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, 49804845 + 49804846.

It is an arithmetic number, because the mean of its divisors is an integer number (49804846).

Almost surely, 2^99609691 is an apocalyptic number.

99609691 is a deficient number, since it is larger than the sum of its proper divisors (1).

99609691 is an equidigital number, since it uses as much as digits as its factorization.

99609691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 99609691 is about 9980.4654701071. The cubic root of 99609691 is about 463.5542113492.

The spelling of 99609691 in words is "ninety-nine million, six hundred nine thousand, six hundred ninety-one".