99999499 has 4 divisors (see below), whose sum is σ = 101886336. Its totient is φ = 98112664.

The previous prime is 99999481. The next prime is 99999509. The reversal of 99999499 is 99499999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99499999 = 6131 ⋅16229.

It is a cyclic number.

It is not a de Polignac number, because 99999499 - 2¹⁵ = 99966731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943339 + ... + 943444.

It is an arithmetic number, because the mean of its divisors is an integer number (25471584).

Almost surely, 2^99999499 is an apocalyptic number.

99999499 is a deficient number, since it is larger than the sum of its proper divisors (1886837).

99999499 is a wasteful number, since it uses less digits than its factorization.

99999499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886836.

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

The square root of 99999499 is about 9999.9749499686. The cubic root of 99999499 is about 464.1581082146.

Subtracting from 99999499 its reverse (99499999), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 99999499 in words is "ninety-nine million, nine hundred ninety-nine thousand, four hundred ninety-nine".