99949999 has 2 divisors, whose sum is σ = 99950000. Its totient is φ = 99949998.

The previous prime is 99949991. The next prime is 99950003. The reversal of 99949999 is 99994999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99949999 - 2³ = 99949991 is a prime.

99949999 is a modest number, since divided by 9999 gives 9994 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99949991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49974999 + 49975000.

It is an arithmetic number, because the mean of its divisors is an integer number (49975000).

Almost surely, 2^99949999 is an apocalyptic number.

99949999 is a deficient number, since it is larger than the sum of its proper divisors (1).

99949999 is an equidigital number, since it uses as much as digits as its factorization.

99949999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19131876, while the sum is 67.

The square root of 99949999 is about 9997.4996374093. The cubic root of 99949999 is about 464.0815091028.

The spelling of 99949999 in words is "ninety-nine million, nine hundred forty-nine thousand, nine hundred ninety-nine".