121891843 has 8 divisors (see below), whose sum is σ = 126236880. Its totient is φ = 117556320.

The previous prime is 121891837. The next prime is 121891867. The reversal of 121891843 is 348198121.

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 121891843 - 2⁹ = 121891331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121891813) 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, 32653 + ... + 36193.

It is an arithmetic number, because the mean of its divisors is an integer number (15779610).

Almost surely, 2^121891843 is an apocalyptic number.

121891843 is a deficient number, since it is larger than the sum of its proper divisors (4345037).

121891843 is a wasteful number, since it uses less digits than its factorization.

121891843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4757.

The product of its digits is 13824, while the sum is 37.

The square root of 121891843 is about 11040.4638942392. The cubic root of 121891843 is about 495.8209592154.

The spelling of 121891843 in words is "one hundred twenty-one million, eight hundred ninety-one thousand, eight hundred forty-three".