194589317881 has 12 divisors (see below), whose sum is σ = 226367505408. Its totient is φ = 166784578632.

The previous prime is 194589317821. The next prime is 194589317911. The reversal of 194589317881 is 188713985491.

It is not a de Polignac number, because 194589317881 - 2¹⁹ = 194588793593 is a prime.

It is a super-2 number, since 2×194589317881² (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 (194589317801) 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, 1642420 + ... + 1756906.

It is an arithmetic number, because the mean of its divisors is an integer number (18863958784).

Almost surely, 2^194589317881 is an apocalyptic number.

It is an amenable number.

194589317881 is a deficient number, since it is larger than the sum of its proper divisors (31778187527).

194589317881 is a wasteful number, since it uses less digits than its factorization.

194589317881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149188 (or 149181 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 64.

It can be divided in two parts, 19458 and 9317881, that added together give a palindrome (9337339).

The spelling of 194589317881 in words is "one hundred ninety-four billion, five hundred eighty-nine million, three hundred seventeen thousand, eight hundred eighty-one".