121565225 has 6 divisors (see below), whose sum is σ = 150740910. Its totient is φ = 97252160.

The previous prime is 121565219. The next prime is 121565231. The reversal of 121565225 is 522565121.

It is an interprime number because it is at equal distance from previous prime (121565219) and next prime (121565231).

It can be written as a sum of positive squares in 3 ways, for example, as 8185321 + 113379904 = 2861^2 + 10648^2 .

It is not a de Polignac number, because 121565225 - 2⁴ = 121565209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2431280 + ... + 2431329.

It is an arithmetic number, because the mean of its divisors is an integer number (25123485).

Almost surely, 2^121565225 is an apocalyptic number.

It is an amenable number.

121565225 is a deficient number, since it is larger than the sum of its proper divisors (29175685).

121565225 is an equidigital number, since it uses as much as digits as its factorization.

121565225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4862619 (or 4862614 counting only the distinct ones).

The product of its digits is 6000, while the sum is 29.

The square root of 121565225 is about 11025.6621116376. The cubic root of 121565225 is about 495.3777003702.

The spelling of 121565225 in words is "one hundred twenty-one million, five hundred sixty-five thousand, two hundred twenty-five".