121605506 has 32 divisors (see below), whose sum is σ = 202953600. Its totient is φ = 54186880.

The previous prime is 121605487. The next prime is 121605511. The reversal of 121605506 is 605506121.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338555 + ... + 338913.

It is an arithmetic number, because the mean of its divisors is an integer number (6342300).

Almost surely, 2^121605506 is an apocalyptic number.

121605506 is a deficient number, since it is larger than the sum of its proper divisors (81348094).

121605506 is a wasteful number, since it uses less digits than its factorization.

121605506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 121605506 is about 11027.4886533607. The cubic root of 121605506 is about 495.4324092877.

The spelling of 121605506 in words is "one hundred twenty-one million, six hundred five thousand, five hundred six".