121617856 has 28 divisors (see below), whose sum is σ = 241950240. Its totient is φ = 60654080.

The previous prime is 121617833. The next prime is 121617869. The reversal of 121617856 is 658716121.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

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 3 ways as a sum of consecutive naturals, for example, 25380 + ... + 29788.

It is an arithmetic number, because the mean of its divisors is an integer number (8641080).

Almost surely, 2^121617856 is an apocalyptic number.

121617856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121617856 is a deficient number, since it is larger than the sum of its proper divisors (120332384).

121617856 is an equidigital number, since it uses as much as digits as its factorization.

121617856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4852 (or 4842 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 121617856 is about 11028.0486034475. The cubic root of 121617856 is about 495.4491804119.

The spelling of 121617856 in words is "one hundred twenty-one million, six hundred seventeen thousand, eight hundred fifty-six".