121856601 has 16 divisors (see below), whose sum is σ = 165582720. Its totient is φ = 79699200.

The previous prime is 121856597. The next prime is 121856611. The reversal of 121856601 is 106658121.

It is not a de Polignac number, because 121856601 - 2² = 121856597 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121856611) 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 15 ways as a sum of consecutive naturals, for example, 32460 + ... + 36018.

It is an arithmetic number, because the mean of its divisors is an integer number (10348920).

Almost surely, 2^121856601 is an apocalyptic number.

It is an amenable number.

121856601 is a deficient number, since it is larger than the sum of its proper divisors (43726119).

121856601 is a wasteful number, since it uses less digits than its factorization.

121856601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3776.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 121856601 is about 11038.8677408510. The cubic root of 121856601 is about 495.7731698361.

The spelling of 121856601 in words is "one hundred twenty-one million, eight hundred fifty-six thousand, six hundred one".