189121743491 has 8 divisors (see below), whose sum is σ = 194804832768. Its totient is φ = 183489624000.

The previous prime is 189121743469. The next prime is 189121743533. The reversal of 189121743491 is 194347121981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189121743491 is a prime.

It is a super-2 number, since 2×189121743491² (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 (189121743451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12734915 + ... + 12749756.

It is an arithmetic number, because the mean of its divisors is an integer number (24350604096).

Almost surely, 2^189121743491 is an apocalyptic number.

189121743491 is a deficient number, since it is larger than the sum of its proper divisors (5683089277).

189121743491 is a wasteful number, since it uses less digits than its factorization.

189121743491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25484893.

The product of its digits is 435456, while the sum is 50.

The spelling of 189121743491 in words is "one hundred eighty-nine billion, one hundred twenty-one million, seven hundred forty-three thousand, four hundred ninety-one".