121743791 has 4 divisors (see below), whose sum is σ = 131108712. Its totient is φ = 112378872.

The previous prime is 121743731. The next prime is 121743803. The reversal of 121743791 is 197347121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121743791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121743701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4682441 + ... + 4682466.

It is an arithmetic number, because the mean of its divisors is an integer number (32777178).

Almost surely, 2^121743791 is an apocalyptic number.

121743791 is a deficient number, since it is larger than the sum of its proper divisors (9364921).

121743791 is an equidigital number, since it uses as much as digits as its factorization.

121743791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9364920.

The product of its digits is 10584, while the sum is 35.

The square root of 121743791 is about 11033.7568851230. The cubic root of 121743791 is about 495.6201335667.

The spelling of 121743791 in words is "one hundred twenty-one million, seven hundred forty-three thousand, seven hundred ninety-one".