121578225 has 12 divisors (see below), whose sum is σ = 201009456. Its totient is φ = 64841680.

The previous prime is 121578217. The next prime is 121578229. The reversal of 121578225 is 522875121.

It is not a de Polignac number, because 121578225 - 2³ = 121578217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121578229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 810447 + ... + 810596.

It is an arithmetic number, because the mean of its divisors is an integer number (16750788).

Almost surely, 2^121578225 is an apocalyptic number.

121578225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121578225 is a deficient number, since it is larger than the sum of its proper divisors (79431231).

121578225 is a wasteful number, since it uses less digits than its factorization.

121578225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621056 (or 1621051 counting only the distinct ones).

The product of its digits is 11200, while the sum is 33.

The square root of 121578225 is about 11026.2516296337. The cubic root of 121578225 is about 495.3953580530.

The spelling of 121578225 in words is "one hundred twenty-one million, five hundred seventy-eight thousand, two hundred twenty-five".