121605685 has 8 divisors (see below), whose sum is σ = 149031936. Its totient is φ = 95214480.

The previous prime is 121605637. The next prime is 121605703. The reversal of 121605685 is 586506121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121605685 - 2¹⁹ = 121081397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121605685.

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 7 ways as a sum of consecutive naturals, for example, 258501 + ... + 258970.

It is an arithmetic number, because the mean of its divisors is an integer number (18628992).

Almost surely, 2^121605685 is an apocalyptic number.

It is an amenable number.

121605685 is a deficient number, since it is larger than the sum of its proper divisors (27426251).

121605685 is an equidigital number, since it uses as much as digits as its factorization.

121605685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517523.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 121605685 is about 11027.4967694396. The cubic root of 121605685 is about 495.4326523752.

The spelling of 121605685 in words is "one hundred twenty-one million, six hundred five thousand, six hundred eighty-five".