1011009999 has 4 divisors (see below), whose sum is σ = 1348013336. Its totient is φ = 674006664.

The previous prime is 1011009991. The next prime is 1011010019. The reversal of 1011009999 is 9999001101.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1011009999 - 2³ = 1011009991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011009991) 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, 168501664 + ... + 168501669.

It is an arithmetic number, because the mean of its divisors is an integer number (337003334).

Almost surely, 2^1011009999 is an apocalyptic number.

1011009999 is a deficient number, since it is larger than the sum of its proper divisors (337003337).

1011009999 is an equidigital number, since it uses as much as digits as its factorization.

1011009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337003336.

The product of its (nonzero) digits is 6561, while the sum is 39.

The square root of 1011009999 is about 31796.3834264213. The cubic root of 1011009999 is about 1003.6566125540.

The spelling of 1011009999 in words is "one billion, eleven million, nine thousand, nine hundred ninety-nine".