121688525 has 24 divisors (see below), whose sum is σ = 172935360. Its totient is φ = 83208960.

The previous prime is 121688491. The next prime is 121688531. The reversal of 121688525 is 525886121.

It is not a de Polignac number, because 121688525 - 2⁶ = 121688461 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 80981 + ... + 82469.

It is an arithmetic number, because the mean of its divisors is an integer number (7205640).

Almost surely, 2^121688525 is an apocalyptic number.

It is an amenable number.

121688525 is a deficient number, since it is larger than the sum of its proper divisors (51246835).

121688525 is a wasteful number, since it uses less digits than its factorization.

121688525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973 (or 1968 counting only the distinct ones).

The product of its digits is 38400, while the sum is 38.

The square root of 121688525 is about 11031.2521954672. The cubic root of 121688525 is about 495.5451260780.

The spelling of 121688525 in words is "one hundred twenty-one million, six hundred eighty-eight thousand, five hundred twenty-five".