121265289 has 32 divisors (see below), whose sum is σ = 185328000. Its totient is φ = 78321600.

The previous prime is 121265281. The next prime is 121265303. The reversal of 121265289 is 982562121.

121265289 is a `hidden beast` number, since 1 + 2 + 126 + 528 + 9 = 666.

It is not a de Polignac number, because 121265289 - 2³ = 121265281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121265281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172639 + ... + 173339.

It is an arithmetic number, because the mean of its divisors is an integer number (5791500).

Almost surely, 2^121265289 is an apocalyptic number.

It is an amenable number.

121265289 is a deficient number, since it is larger than the sum of its proper divisors (64062711).

121265289 is a wasteful number, since it uses less digits than its factorization.

121265289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902 (or 896 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 121265289 is about 11012.0519886168. The cubic root of 121265289 is about 494.9699522624.

The spelling of 121265289 in words is "one hundred twenty-one million, two hundred sixty-five thousand, two hundred eighty-nine".