121684725 has 72 divisors (see below), whose sum is σ = 238946760. Its totient is φ = 58920960.

The previous prime is 121684687. The next prime is 121684729. The reversal of 121684725 is 527486121.

121684725 is a `hidden beast` number, since 121 + 68 + 472 + 5 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 26563716 + 95121009 = 5154^2 + 9753^2 .

It is not a de Polignac number, because 121684725 - 2⁸ = 121684469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121684725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121684729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 110377 + ... + 111473.

It is an arithmetic number, because the mean of its divisors is an integer number (3318705).

Almost surely, 2^121684725 is an apocalyptic number.

121684725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121684725 is a deficient number, since it is larger than the sum of its proper divisors (117262035).

121684725 is a wasteful number, since it uses less digits than its factorization.

121684725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159 (or 1151 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 121684725 is about 11031.0799561965. The cubic root of 121684725 is about 495.5399678511.

The spelling of 121684725 in words is "one hundred twenty-one million, six hundred eighty-four thousand, seven hundred twenty-five".