121225725 has 72 divisors (see below), whose sum is σ = 235813032. Its totient is φ = 59289600.

The previous prime is 121225703. The next prime is 121225763. The reversal of 121225725 is 527522121.

It can be written as a sum of positive squares in 12 ways, for example, as 78375609 + 42850116 = 8853^2 + 6546^2 .

It is not a de Polignac number, because 121225725 - 2⁵ = 121225693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 156439 + ... + 157211.

It is an arithmetic number, because the mean of its divisors is an integer number (3275181).

Almost surely, 2^121225725 is an apocalyptic number.

121225725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121225725 is a deficient number, since it is larger than the sum of its proper divisors (114587307).

121225725 is a wasteful number, since it uses less digits than its factorization.

121225725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847 (or 839 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 121225725 is about 11010.2554466279. The cubic root of 121225725 is about 494.9161167929.

Adding to 121225725 its reverse (527522121), we get a palindrome (648747846).

The spelling of 121225725 in words is "one hundred twenty-one million, two hundred twenty-five thousand, seven hundred twenty-five".