11851486109 has 4 divisors (see below), whose sum is σ = 11851736604. Its totient is φ = 11851235616.

The previous prime is 11851486079. The next prime is 11851486123. The reversal of 11851486109 is 90168415811.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5890102009 + 5961384100 = 76747^2 + 77210^2 .

It is a cyclic number.

It is not a de Polignac number, because 11851486109 - 2⁸ = 11851485853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11851486109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11851486159) 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, 30272 + ... + 156905.

It is an arithmetic number, because the mean of its divisors is an integer number (2962934151).

Almost surely, 2^11851486109 is an apocalyptic number.

It is an amenable number.

11851486109 is a deficient number, since it is larger than the sum of its proper divisors (250495).

11851486109 is an equidigital number, since it uses as much as digits as its factorization.

11851486109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250494.

The product of its (nonzero) digits is 69120, while the sum is 44.

The spelling of 11851486109 in words is "eleven billion, eight hundred fifty-one million, four hundred eighty-six thousand, one hundred nine".