11818432009 has 4 divisors (see below), whose sum is σ = 11893708804. Its totient is φ = 11743155216.

The previous prime is 11818431983. The next prime is 11818432027. The reversal of 11818432009 is 90023481811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90023481811 = 18661 ⋅4824151.

It can be written as a sum of positive squares in 2 ways, for example, as 1256348025 + 10562083984 = 35445^2 + 102772^2 .

It is a cyclic number.

It is not a de Polignac number, because 11818432009 - 2¹⁷ = 11818300937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11818432709) 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, 37638162 + ... + 37638475.

It is an arithmetic number, because the mean of its divisors is an integer number (2973427201).

Almost surely, 2^11818432009 is an apocalyptic number.

It is an amenable number.

11818432009 is a deficient number, since it is larger than the sum of its proper divisors (75276795).

11818432009 is an equidigital number, since it uses as much as digits as its factorization.

11818432009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75276794.

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 11818432009 in words is "eleven billion, eight hundred eighteen million, four hundred thirty-two thousand, nine".