1894453555109 has 4 divisors (see below), whose sum is σ = 1894456332000. Its totient is φ = 1894450778220.

The previous prime is 1894453555019. The next prime is 1894453555201. The reversal of 1894453555109 is 9015553544981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1894453555109 - 2¹⁶ = 1894453489573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1894453555609) 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 3 ways as a sum of consecutive naturals, for example, 420392 + ... + 1991390.

It is an arithmetic number, because the mean of its divisors is an integer number (473614083000).

Almost surely, 2^{1894453555109} is an apocalyptic number.

It is an amenable number.

1894453555109 is a deficient number, since it is larger than the sum of its proper divisors (2776891).

1894453555109 is a wasteful number, since it uses less digits than its factorization.

1894453555109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776890.

The product of its (nonzero) digits is 19440000, while the sum is 59.

The spelling of 1894453555109 in words is "one trillion, eight hundred ninety-four billion, four hundred fifty-three million, five hundred fifty-five thousand, one hundred nine".