194395481281 has 4 divisors (see below), whose sum is σ = 202847458752. Its totient is φ = 185943503812.

The previous prime is 194395481279. The next prime is 194395481333. The reversal of 194395481281 is 182184593491.

194395481281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an emirpimes, since its reverse is a distinct semiprime: 182184593491 = 44249 ⋅4117259.

It is a cyclic number.

It is not a de Polignac number, because 194395481281 - 2¹ = 194395481279 is a prime.

It is a super-2 number, since 2×194395481281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194395481381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4225988701 + ... + 4225988746.

It is an arithmetic number, because the mean of its divisors is an integer number (50711864688).

Almost surely, 2^194395481281 is an apocalyptic number.

It is an amenable number.

194395481281 is a deficient number, since it is larger than the sum of its proper divisors (8451977471).

194395481281 is an equidigital number, since it uses as much as digits as its factorization.

194395481281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8451977470.

The product of its digits is 2488320, while the sum is 55.

The spelling of 194395481281 in words is "one hundred ninety-four billion, three hundred ninety-five million, four hundred eighty-one thousand, two hundred eighty-one".