191131889389 has 64 divisors (see below), whose sum is σ = 244257914880. Its totient is φ = 145808087040.

The previous prime is 191131889387. The next prime is 191131889401. The reversal of 191131889389 is 983988131191.

It is not a de Polignac number, because 191131889389 - 2¹ = 191131889387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191131889387) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31386657 + ... + 31392745.

It is an arithmetic number, because the mean of its divisors is an integer number (3816529920).

Almost surely, 2^191131889389 is an apocalyptic number.

It is an amenable number.

191131889389 is a deficient number, since it is larger than the sum of its proper divisors (53126025491).

191131889389 is a wasteful number, since it uses less digits than its factorization.

191131889389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6338.

The product of its digits is 3359232, while the sum is 61.

The spelling of 191131889389 in words is "one hundred ninety-one billion, one hundred thirty-one million, eight hundred eighty-nine thousand, three hundred eighty-nine".