999499999 has 2 divisors, whose sum is σ = 999500000. Its totient is φ = 999499998.

The previous prime is 999499967. The next prime is 999500011. The reversal of 999499999 is 999994999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999499999 - 2⁵ = 999499967 is a prime.

999499999 is a modest number, since divided by 99999 gives 9994 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999299999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499749999 + 499750000.

It is an arithmetic number, because the mean of its divisors is an integer number (499750000).

Almost surely, 2^999499999 is an apocalyptic number.

999499999 is a deficient number, since it is larger than the sum of its proper divisors (1).

999499999 is an equidigital number, since it uses as much as digits as its factorization.

999499999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172186884, while the sum is 76.

The square root of 999499999 is about 31614.8699032591. The cubic root of 999499999 is about 999.8333052144.

The spelling of 999499999 in words is "nine hundred ninety-nine million, four hundred ninety-nine thousand, nine hundred ninety-nine".