121689025 has 24 divisors (see below), whose sum is σ = 155552544. Its totient is φ = 94377600.

The previous prime is 121689019. The next prime is 121689031. The reversal of 121689025 is 520986121.

It is an interprime number because it is at equal distance from previous prime (121689019) and next prime (121689031).

It is a de Polignac number, because none of the positive numbers 2^k-121689025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 232414 + ... + 232936.

It is an arithmetic number, because the mean of its divisors is an integer number (6481356).

Almost surely, 2^121689025 is an apocalyptic number.

It is an amenable number.

121689025 is a deficient number, since it is larger than the sum of its proper divisors (33863519).

121689025 is a wasteful number, since it uses less digits than its factorization.

121689025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 796 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 121689025 is about 11031.2748583289. The cubic root of 121689025 is about 495.5458047841.

The spelling of 121689025 in words is "one hundred twenty-one million, six hundred eighty-nine thousand, twenty-five".