99967999 has 2 divisors, whose sum is σ = 99968000. Its totient is φ = 99967998.

The previous prime is 99967997. The next prime is 99968003. The reversal of 99967999 is 99976999.

It is a weak prime.

It is an emirp because it is prime and its reverse (99976999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99967999 - 2¹ = 99967997 is a prime.

Together with 99967997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99967993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49983999 + 49984000.

It is an arithmetic number, because the mean of its divisors is an integer number (49984000).

Almost surely, 2^99967999 is an apocalyptic number.

99967999 is a deficient number, since it is larger than the sum of its proper divisors (1).

99967999 is an equidigital number, since it uses as much as digits as its factorization.

99967999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22320522, while the sum is 67.

The square root of 99967999 is about 9998.3998219715. The cubic root of 99967999 is about 464.1093662508.

The spelling of 99967999 in words is "ninety-nine million, nine hundred sixty-seven thousand, nine hundred ninety-nine".