1161809376149 has 4 divisors (see below), whose sum is σ = 1201871768460. Its totient is φ = 1121746983840.

The previous prime is 1161809376131. The next prime is 1161809376191. The reversal of 1161809376149 is 9416739081611.

It is a happy number.

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 635618724049 + 526190652100 = 797257^2 + 725390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161809376149 - 2²⁴ = 1161792598933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1161809376094 and 1161809376103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161809306149) 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, 20031196112 + ... + 20031196169.

It is an arithmetic number, because the mean of its divisors is an integer number (300467942115).

Almost surely, 2^{1161809376149} is an apocalyptic number.

It is an amenable number.

1161809376149 is a deficient number, since it is larger than the sum of its proper divisors (40062392311).

1161809376149 is an equidigital number, since it uses as much as digits as its factorization.

1161809376149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40062392310.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The spelling of 1161809376149 in words is "one trillion, one hundred sixty-one billion, eight hundred nine million, three hundred seventy-six thousand, one hundred forty-nine".