121888197 has 6 divisors (see below), whose sum is σ = 176060742. Its totient is φ = 81258792.

The previous prime is 121888183. The next prime is 121888237. The reversal of 121888197 is 791888121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 116510436 + 5377761 = 10794^2 + 2319^2 .

It is not a de Polignac number, because 121888197 - 2⁶ = 121888133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121888177) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6771558 + ... + 6771575.

It is an arithmetic number, because the mean of its divisors is an integer number (29343457).

Almost surely, 2^121888197 is an apocalyptic number.

It is an amenable number.

121888197 is a deficient number, since it is larger than the sum of its proper divisors (54172545).

121888197 is a wasteful number, since it uses less digits than its factorization.

121888197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13543139 (or 13543136 counting only the distinct ones).

The product of its digits is 64512, while the sum is 45.

The square root of 121888197 is about 11040.2987731311. The cubic root of 121888197 is about 495.8160155397.

The spelling of 121888197 in words is "one hundred twenty-one million, eight hundred eighty-eight thousand, one hundred ninety-seven".