121778541 has 12 divisors (see below), whose sum is σ = 176438080. Its totient is φ = 80938440.

The previous prime is 121778483. The next prime is 121778557. The reversal of 121778541 is 145877121.

It is not a de Polignac number, because 121778541 - 2⁶ = 121778477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121778496 and 121778505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121778641) 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 11 ways as a sum of consecutive naturals, for example, 17461 + ... + 23418.

Almost surely, 2^121778541 is an apocalyptic number.

It is an amenable number.

121778541 is a deficient number, since it is larger than the sum of its proper divisors (54659539).

121778541 is a wasteful number, since it uses less digits than its factorization.

121778541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41216 (or 41213 counting only the distinct ones).

The product of its digits is 15680, while the sum is 36.

The square root of 121778541 is about 11035.3314857325. The cubic root of 121778541 is about 495.6672849412.

The spelling of 121778541 in words is "one hundred twenty-one million, seven hundred seventy-eight thousand, five hundred forty-one".