1011809899 has 4 divisors (see below), whose sum is σ = 1044448960. Its totient is φ = 979170840.

The previous prime is 1011809873. The next prime is 1011809933. The reversal of 1011809899 is 9989081101.

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

It is a cyclic number.

It is not a de Polignac number, because 1011809899 - 2¹¹ = 1011807851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011801899) 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, 16319484 + ... + 16319545.

It is an arithmetic number, because the mean of its divisors is an integer number (261112240).

Almost surely, 2^1011809899 is an apocalyptic number.

1011809899 is a deficient number, since it is larger than the sum of its proper divisors (32639061).

1011809899 is an equidigital number, since it uses as much as digits as its factorization.

1011809899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32639060.

The product of its (nonzero) digits is 46656, while the sum is 46.

The square root of 1011809899 is about 31808.9594139764. The cubic root of 1011809899 is about 1003.9212368042.

The spelling of 1011809899 in words is "one billion, eleven million, eight hundred nine thousand, eight hundred ninety-nine".