11899383809 has 4 divisors (see below), whose sum is σ = 11899827540. Its totient is φ = 11898940080.

The previous prime is 11899383803. The next prime is 11899383817. The reversal of 11899383809 is 90838399811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90838399811 = 17 ⋅5343435283.

It can be written as a sum of positive squares in 2 ways, for example, as 9835680625 + 2063703184 = 99175^2 + 45428^2 .

It is a cyclic number.

It is not a de Polignac number, because 11899383809 - 2¹⁶ = 11899318273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11899383803) 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, 178862 + ... + 236199.

It is an arithmetic number, because the mean of its divisors is an integer number (2974956885).

Almost surely, 2^11899383809 is an apocalyptic number.

It is an amenable number.

11899383809 is a deficient number, since it is larger than the sum of its proper divisors (443731).

11899383809 is an equidigital number, since it uses as much as digits as its factorization.

11899383809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443730.

The product of its (nonzero) digits is 3359232, while the sum is 59.

The spelling of 11899383809 in words is "eleven billion, eight hundred ninety-nine million, three hundred eighty-three thousand, eight hundred nine".