191961858089 has 8 divisors (see below), whose sum is σ = 200528894400. Its totient is φ = 183413227536.

The previous prime is 191961858079. The next prime is 191961858139. The reversal of 191961858089 is 980858169191.

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 191961858089 - 2⁴ = 191961858073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191961858059) 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, 4580114 + ... + 4621835.

It is an arithmetic number, because the mean of its divisors is an integer number (25066111800).

Almost surely, 2^191961858089 is an apocalyptic number.

It is an amenable number.

191961858089 is a deficient number, since it is larger than the sum of its proper divisors (8567036311).

191961858089 is an equidigital number, since it uses as much as digits as its factorization.

191961858089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9202879.

The product of its (nonzero) digits is 11197440, while the sum is 65.

The spelling of 191961858089 in words is "one hundred ninety-one billion, nine hundred sixty-one million, eight hundred fifty-eight thousand, eighty-nine".