11985542149 has 6 divisors (see below), whose sum is σ = 13942365414. Its totient is φ = 10273321800.

The previous prime is 11985542143. The next prime is 11985542189. The reversal of 11985542149 is 94124558911.

It can be written as a sum of positive squares in only one way, i.e., 10443409249 + 1542132900 = 102193^2 + 39270^2 .

It is not a de Polignac number, because 11985542149 - 2³ = 11985542141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 244602901 = 11985542149 / (1 + 1 + 9 + 8 + 5 + 5 + 4 + 2 + 1 + 4 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11985542141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122301402 + ... + 122301499.

It is an arithmetic number, because the mean of its divisors is an integer number (2323727569).

Almost surely, 2^11985542149 is an apocalyptic number.

It is an amenable number.

11985542149 is a deficient number, since it is larger than the sum of its proper divisors (1956823265).

11985542149 is an equidigital number, since it uses as much as digits as its factorization.

11985542149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244602915 (or 244602908 counting only the distinct ones).

The product of its digits is 518400, while the sum is 49.

The spelling of 11985542149 in words is "eleven billion, nine hundred eighty-five million, five hundred forty-two thousand, one hundred forty-nine".