193864889491 has 8 divisors (see below), whose sum is σ = 238602941024. Its totient is φ = 153387604800.

The previous prime is 193864889453. The next prime is 193864889551. The reversal of 193864889491 is 194988468391.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 193864889491 - 2⁹ = 193864888979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 193864889491.

It is not an unprimeable number, because it can be changed into a prime (193864889791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1065191610 + ... + 1065191791.

It is an arithmetic number, because the mean of its divisors is an integer number (29825367628).

Almost surely, 2^193864889491 is an apocalyptic number.

193864889491 is a deficient number, since it is larger than the sum of its proper divisors (44738051533).

193864889491 is a wasteful number, since it uses less digits than its factorization.

193864889491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130383421.

The product of its digits is 107495424, while the sum is 70.

The spelling of 193864889491 in words is "one hundred ninety-three billion, eight hundred sixty-four million, eight hundred eighty-nine thousand, four hundred ninety-one".