999099919 has 2 divisors, whose sum is σ = 999099920. Its totient is φ = 999099918.

The previous prime is 999099901. The next prime is 999099953. The reversal of 999099919 is 919990999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999099919 - 2⁵ = 999099887 is a prime.

It is a super-2 number, since 2×999099919² = 1996401296291613122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999099719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499549959 + 499549960.

It is an arithmetic number, because the mean of its divisors is an integer number (499549960).

Almost surely, 2^999099919 is an apocalyptic number.

999099919 is a deficient number, since it is larger than the sum of its proper divisors (1).

999099919 is an equidigital number, since it uses as much as digits as its factorization.

999099919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4782969, while the sum is 64.

The square root of 999099919 is about 31608.5418676661. The cubic root of 999099919 is about 999.6998829388.

It can be divided in two parts, 9990999 and 19, that multiplied together give a palindrome (189828981).

The spelling of 999099919 in words is "nine hundred ninety-nine million, ninety-nine thousand, nine hundred nineteen".