121297791 has 8 divisors (see below), whose sum is σ = 168762240. Its totient is φ = 77349272.

The previous prime is 121297789. The next prime is 121297811. The reversal of 121297791 is 197792121.

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 121297791 - 2¹ = 121297789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121297751) 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, 878901 + ... + 879038.

It is an arithmetic number, because the mean of its divisors is an integer number (21095280).

Almost surely, 2^121297791 is an apocalyptic number.

121297791 is a deficient number, since it is larger than the sum of its proper divisors (47464449).

121297791 is a wasteful number, since it uses less digits than its factorization.

121297791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757965.

The product of its digits is 15876, while the sum is 39.

The square root of 121297791 is about 11013.5276365023. The cubic root of 121297791 is about 495.0141695770.

The spelling of 121297791 in words is "one hundred twenty-one million, two hundred ninety-seven thousand, seven hundred ninety-one".