121755197 has 16 divisors (see below), whose sum is σ = 130481664. Its totient is φ = 113400000.

The previous prime is 121755163. The next prime is 121755203. The reversal of 121755197 is 791557121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121755197 - 2⁶ = 121755133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121755197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121755157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115322 + ... + 116372.

It is an arithmetic number, because the mean of its divisors is an integer number (8155104).

Almost surely, 2^121755197 is an apocalyptic number.

It is an amenable number.

121755197 is a deficient number, since it is larger than the sum of its proper divisors (8726467).

121755197 is a wasteful number, since it uses less digits than its factorization.

121755197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220.

The product of its digits is 22050, while the sum is 38.

The square root of 121755197 is about 11034.2737413932. The cubic root of 121755197 is about 495.6356110616.

The spelling of 121755197 in words is "one hundred twenty-one million, seven hundred fifty-five thousand, one hundred ninety-seven".