1891832140449 has 12 divisors (see below), whose sum is σ = 2734083928212. Its totient is φ = 1260557964000.

The previous prime is 1891832140423. The next prime is 1891832140463. The reversal of 1891832140449 is 9440412381981.

1891832140449 is a `hidden beast` number, since 1 + 8 + 9 + 183 + 2 + 14 + 0 + 449 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 75442510224 + 1816389630225 = 274668^2 + 1347735^2 .

It is not a de Polignac number, because 1891832140449 - 2⁵ = 1891832140417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1891832140395 and 1891832140404.

It is not an unprimeable number, because it can be changed into a prime (1891832100449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55270522 + ... + 55304739.

It is an arithmetic number, because the mean of its divisors is an integer number (227840327351).

Almost surely, 2^{1891832140449} is an apocalyptic number.

It is an amenable number.

1891832140449 is a deficient number, since it is larger than the sum of its proper divisors (842251787763).

1891832140449 is a wasteful number, since it uses less digits than its factorization.

1891832140449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110577168 (or 110577165 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 1891832140449 in words is "one trillion, eight hundred ninety-one billion, eight hundred thirty-two million, one hundred forty thousand, four hundred forty-nine".